865606491 has 6 divisors (see below), whose sum is σ = 1250320500. Its totient is φ = 577070988.

The previous prime is 865606457. The next prime is 865606501. The reversal of 865606491 is 194606568.

865606491 is a `hidden beast` number, since 86 + 560 + 6 + 4 + 9 + 1 = 666.

It is not a de Polignac number, because 865606491 - 2⁷ = 865606363 is a prime.

It is a super-2 number, since 2×865606491² = 1498549194522666162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (865606451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48089241 + ... + 48089258.

It is an arithmetic number, because the mean of its divisors is an integer number (208386750).

Almost surely, 2^865606491 is an apocalyptic number.

865606491 is a deficient number, since it is larger than the sum of its proper divisors (384714009).

865606491 is a wasteful number, since it uses less digits than its factorization.

865606491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96178505 (or 96178502 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 865606491 is about 29421.1911893451. The cubic root of 865606491 is about 953.0305771494.

The spelling of 865606491 in words is "eight hundred sixty-five million, six hundred six thousand, four hundred ninety-one".