857924961 has 4 divisors (see below), whose sum is σ = 1143899952. Its totient is φ = 571949972.

The previous prime is 857924933. The next prime is 857924987. The reversal of 857924961 is 169429758.

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 857924961 - 2⁵ = 857924929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (857923961) 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, 142987491 + ... + 142987496.

It is an arithmetic number, because the mean of its divisors is an integer number (285974988).

Almost surely, 2^857924961 is an apocalyptic number.

It is an amenable number.

857924961 is a deficient number, since it is larger than the sum of its proper divisors (285974991).

857924961 is a wasteful number, since it uses less digits than its factorization.

857924961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285974990.

The product of its digits is 1088640, while the sum is 51.

The square root of 857924961 is about 29290.3561091360. The cubic root of 857924961 is about 950.2030816072.

The spelling of 857924961 in words is "eight hundred fifty-seven million, nine hundred twenty-four thousand, nine hundred sixty-one".