861579265 has 4 divisors (see below), whose sum is σ = 1033895124. Its totient is φ = 689263408.

The previous prime is 861579253. The next prime is 861579319. The reversal of 861579265 is 562975168.

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

It can be written as a sum of positive squares in 2 ways, for example, as 234978241 + 626601024 = 15329^2 + 25032^2 .

It is a cyclic number.

It is not a de Polignac number, because 861579265 - 2¹⁷ = 861448193 is a prime.

It is a Duffinian number.

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, 86157922 + ... + 86157931.

It is an arithmetic number, because the mean of its divisors is an integer number (258473781).

Almost surely, 2^861579265 is an apocalyptic number.

It is an amenable number.

861579265 is a deficient number, since it is larger than the sum of its proper divisors (172315859).

861579265 is a wasteful number, since it uses less digits than its factorization.

861579265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172315858.

The product of its digits is 907200, while the sum is 49.

The square root of 861579265 is about 29352.6704917968. The cubic root of 861579265 is about 951.5502905197.

The spelling of 861579265 in words is "eight hundred sixty-one million, five hundred seventy-nine thousand, two hundred sixty-five".