531121923 has 12 divisors (see below), whose sum is σ = 767822328. Its totient is φ = 353783040.

The previous prime is 531121901. The next prime is 531121951. The reversal of 531121923 is 329121135.

531121923 is a `hidden beast` number, since 531 + 121 + 9 + 2 + 3 = 666.

It is not a de Polignac number, because 531121923 - 2⁵ = 531121891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531121993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13293 + ... + 35198.

It is an arithmetic number, because the mean of its divisors is an integer number (63985194).

Almost surely, 2^531121923 is an apocalyptic number.

531121923 is a deficient number, since it is larger than the sum of its proper divisors (236700405).

531121923 is a wasteful number, since it uses less digits than its factorization.

531121923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49714 (or 49711 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 531121923 is about 23046.0825955302. The cubic root of 531121923 is about 809.8378596356.

The spelling of 531121923 in words is "five hundred thirty-one million, one hundred twenty-one thousand, nine hundred twenty-three".