811561160 has 16 divisors (see below), whose sum is σ = 1826012700. Its totient is φ = 324624448.

The previous prime is 811561139. The next prime is 811561199. The reversal of 811561160 is 61165118.

It can be written as a sum of positive squares in 2 ways, for example, as 745399204 + 66161956 = 27302^2 + 8134^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10144475 + ... + 10144554.

Almost surely, 2^811561160 is an apocalyptic number.

It is an amenable number.

811561160 is an abundant number, since it is smaller than the sum of its proper divisors (1014451540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811561160 is a wasteful number, since it uses less digits than its factorization.

811561160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20289040 (or 20289036 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 811561160 is about 28487.9125244374. The cubic root of 811561160 is about 932.7682423993.

The spelling of 811561160 in words is "eight hundred eleven million, five hundred sixty-one thousand, one hundred sixty".