231479172 has 18 divisors (see below), whose sum is σ = 585127998. Its totient is φ = 77159712.

The previous prime is 231479167. The next prime is 231479207. The reversal of 231479172 is 271974132.

It can be written as a sum of positive squares in only one way, i.e., 132158016 + 99321156 = 11496^2 + 9966^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6429977 = 231479172 / (2 + 3 + 1 + 4 + 7 + 9 + 1 + 7 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3214953 + ... + 3215024.

It is an arithmetic number, because the mean of its divisors is an integer number (32507111).

Almost surely, 2^231479172 is an apocalyptic number.

It is an amenable number.

231479172 is an abundant number, since it is smaller than the sum of its proper divisors (353648826).

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

231479172 is a wasteful number, since it uses less digits than its factorization.

231479172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6429987 (or 6429982 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 231479172 is about 15214.4395887591. The cubic root of 231479172 is about 614.0032077980.

The spelling of 231479172 in words is "two hundred thirty-one million, four hundred seventy-nine thousand, one hundred seventy-two".