231109240 has 32 divisors (see below), whose sum is σ = 527125680. Its totient is φ = 91176192.

The previous prime is 231109231. The next prime is 231109243. The reversal of 231109240 is 42901132.

It is a super-2 number, since 2×231109240² = 106822961626755200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231109243) 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, 36654 + ... + 42493.

Almost surely, 2^231109240 is an apocalyptic number.

231109240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231109240 is an abundant number, since it is smaller than the sum of its proper divisors (296016440).

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

231109240 is a wasteful number, since it uses less digits than its factorization.

231109240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79231 (or 79227 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 231109240 is about 15202.2774609596. The cubic root of 231109240 is about 613.6759493538.

It can be divided in two parts, 2311092 and 40, that added together give a palindrome (2311132).

The spelling of 231109240 in words is "two hundred thirty-one million, one hundred nine thousand, two hundred forty".