921475863 has 72 divisors (see below), whose sum is σ = 1688887200. Its totient is φ = 473869440.

The previous prime is 921475831. The next prime is 921475873. The reversal of 921475863 is 368574129.

921475863 is a `hidden beast` number, since 9 + 21 + 47 + 586 + 3 = 666.

It is not a de Polignac number, because 921475863 - 2⁵ = 921475831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921475873) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 830353 + ... + 831461.

Almost surely, 2^921475863 is an apocalyptic number.

921475863 is a deficient number, since it is larger than the sum of its proper divisors (767411337).

921475863 is a wasteful number, since it uses less digits than its factorization.

921475863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253 (or 1239 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 921475863 is about 30355.8209080236. The cubic root of 921475863 is about 973.1086236776.

The spelling of 921475863 in words is "nine hundred twenty-one million, four hundred seventy-five thousand, eight hundred sixty-three".