1065855391 has 4 divisors (see below), whose sum is σ = 1066019400. Its totient is φ = 1065691384.

The previous prime is 1065855389. The next prime is 1065855419. The reversal of 1065855391 is 1935585601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1065855391 - 2¹ = 1065855389 is a prime.

It is a super-2 number, since 2×1065855391² = 2272095429047525762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065853391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71836 + ... + 85393.

It is an arithmetic number, because the mean of its divisors is an integer number (266504850).

Almost surely, 2^1065855391 is an apocalyptic number.

1065855391 is a deficient number, since it is larger than the sum of its proper divisors (164009).

1065855391 is an equidigital number, since it uses as much as digits as its factorization.

1065855391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164008.

The product of its (nonzero) digits is 162000, while the sum is 43.

The square root of 1065855391 is about 32647.4408032238. The cubic root of 1065855391 is about 1021.4868074102.

It can be divided in two parts, 10658 and 55391, that added together give a square (66049 = 257²).

The spelling of 1065855391 in words is "one billion, sixty-five million, eight hundred fifty-five thousand, three hundred ninety-one".