231135240 has 64 divisors (see below), whose sum is σ = 792466560. Its totient is φ = 52830720.

The previous prime is 231135239. The next prime is 231135253. The reversal of 231135240 is 42531132.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136741 + ... + 138420.

It is an arithmetic number, because the mean of its divisors is an integer number (12382290).

Almost surely, 2^231135240 is an apocalyptic number.

231135240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231135240 is an abundant number, since it is smaller than the sum of its proper divisors (561331320).

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

231135240 is a wasteful number, since it uses less digits than its factorization.

231135240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275182 (or 275178 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 231135240 is about 15203.1325719406. The cubic root of 231135240 is about 613.6989615253.

Adding to 231135240 its reverse (42531132), we get a palindrome (273666372).

The spelling of 231135240 in words is "two hundred thirty-one million, one hundred thirty-five thousand, two hundred forty".