231974487522 has 90 divisors (see below), whose sum is σ = 527559022683. Its totient is φ = 76186647576.

The previous prime is 231974487457. The next prime is 231974487529. The reversal of 231974487522 is 225784479132.

231974487522 is a `hidden beast` number, since 2 + 3 + 1 + 9 + 74 + 48 + 7 + 522 = 666.

It can be written as a sum of positive squares in only one way, i.e., 115987243761 + 115987243761 = 340569^2 + 340569^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=340569.

It is a super-2 number, since 2×231974487522² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (231974487529) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 484288879 + ... + 484289357.

Almost surely, 2^231974487522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231974487522

231974487522 is an abundant number, since it is smaller than the sum of its proper divisors (295584535161).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231974487522 is an frugal number, since it uses more digits than its factorization.

231974487522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 563 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 231974487522 in words is "two hundred thirty-one billion, nine hundred seventy-four million, four hundred eighty-seven thousand, five hundred twenty-two".