231355240 has 32 divisors (see below), whose sum is σ = 520982280. Its totient is φ = 92465152.

The previous prime is 231355237. The next prime is 231355247. The reversal of 231355240 is 42553132.

231355240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 183385764 + 47969476 = 13542^2 + 6926^2 .

It is not an unprimeable number, because it can be changed into a prime (231355247) 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, 94512 + ... + 96928.

Almost surely, 2^231355240 is an apocalyptic number.

231355240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231355240 is an abundant number, since it is smaller than the sum of its proper divisors (289627040).

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

231355240 is a wasteful number, since it uses less digits than its factorization.

231355240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821 (or 4817 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 231355240 is about 15210.3662020347. The cubic root of 231355240 is about 613.8936108537.

The spelling of 231355240 in words is "two hundred thirty-one million, three hundred fifty-five thousand, two hundred forty".