869609657 has 4 divisors (see below), whose sum is σ = 993839616. Its totient is φ = 745379700.

The previous prime is 869609639. The next prime is 869609659. The reversal of 869609657 is 756906968.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 869609657 - 2⁶ = 869609593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (869609659) 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, 62114969 + ... + 62114982.

It is an arithmetic number, because the mean of its divisors is an integer number (248459904).

Almost surely, 2^869609657 is an apocalyptic number.

It is an amenable number.

869609657 is a deficient number, since it is larger than the sum of its proper divisors (124229959).

869609657 is a wasteful number, since it uses less digits than its factorization.

869609657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124229958.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The square root of 869609657 is about 29489.1447315788. The cubic root of 869609657 is about 954.4974767247.

The spelling of 869609657 in words is "eight hundred sixty-nine million, six hundred nine thousand, six hundred fifty-seven".