231522240 has 56 divisors (see below), whose sum is σ = 735086160. Its totient is φ = 61739008.

The previous prime is 231522233. The next prime is 231522241. The reversal of 231522240 is 42225132.

It is a super-2 number, since 2×231522240² = 107205095229235200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231522241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119625 + ... + 121544.

Almost surely, 2^231522240 is an apocalyptic number.

231522240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231522240 is an abundant number, since it is smaller than the sum of its proper divisors (503563920).

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

231522240 is a wasteful number, since it uses less digits than its factorization.

231522240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241189 (or 241179 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 231522240 is about 15215.8548888980. The cubic root of 231522240 is about 614.0412850183.

Adding to 231522240 its reverse (42225132), we get a palindrome (273747372).

The spelling of 231522240 in words is "two hundred thirty-one million, five hundred twenty-two thousand, two hundred forty".