231172224 has 64 divisors (see below), whose sum is σ = 635256000. Its totient is φ = 74396672.

The previous prime is 231172217. The next prime is 231172231. The reversal of 231172224 is 422271132.

It is an interprime number because it is at equal distance from previous prime (231172217) and next prime (231172231).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 231172194 and 231172203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757 + ... + 21515.

It is an arithmetic number, because the mean of its divisors is an integer number (9925875).

Almost surely, 2^231172224 is an apocalyptic number.

231172224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231172224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317628000).

231172224 is an abundant number, since it is smaller than the sum of its proper divisors (404083776).

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

231172224 is a wasteful number, since it uses less digits than its factorization.

231172224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805 (or 20793 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 231172224 is about 15204.3488515622. The cubic root of 231172224 is about 613.7316924810.

The spelling of 231172224 in words is "two hundred thirty-one million, one hundred seventy-two thousand, two hundred twenty-four".