1065539631 has 12 divisors (see below), whose sum is σ = 1530298392. Its totient is φ = 655591248.

The previous prime is 1065539593. The next prime is 1065539669. The reversal of 1065539631 is 1369355601.

It is an interprime number because it is at equal distance from previous prime (1065539593) and next prime (1065539669).

It is a de Polignac number, because none of the positive numbers 2^k-1065539631 is a prime.

It is a super-3 number, since 3×1065539631³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 1065539631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065539131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201240 + ... + 206466.

It is an arithmetic number, because the mean of its divisors is an integer number (127524866).

Almost surely, 2^1065539631 is an apocalyptic number.

1065539631 is a deficient number, since it is larger than the sum of its proper divisors (464758761).

1065539631 is an frugal number, since it uses more digits than its factorization.

1065539631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10470 (or 5243 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 1065539631 is about 32642.6045376284. The cubic root of 1065539631 is about 1021.3859255165.

Multiplying 1065539631 by its sum of digits (39), we get a square (41556045609 = 203853²).

1065539631 divided by its sum of digits (39) gives a square (27321529 = 5227²).

The spelling of 1065539631 in words is "one billion, sixty-five million, five hundred thirty-nine thousand, six hundred thirty-one".