1071816639 has 16 divisors (see below), whose sum is σ = 1462074624. Its totient is φ = 698230400.

The previous prime is 1071816611. The next prime is 1071816643. The reversal of 1071816639 is 9366181701.

It is a cyclic number.

It is not a de Polignac number, because 1071816639 - 2¹² = 1071812543 is a prime.

It is a super-2 number, since 2×1071816639² = 2297581815274512642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1071816639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1071816439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1804 + ... + 46334.

It is an arithmetic number, because the mean of its divisors is an integer number (91379664).

Almost surely, 2^1071816639 is an apocalyptic number.

1071816639 is a deficient number, since it is larger than the sum of its proper divisors (390257985).

1071816639 is a wasteful number, since it uses less digits than its factorization.

1071816639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44718.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1071816639 is about 32738.6108288058. The cubic root of 1071816639 is about 1023.3876340402.

The spelling of 1071816639 in words is "one billion, seventy-one million, eight hundred sixteen thousand, six hundred thirty-nine".