231653540 has 12 divisors (see below), whose sum is σ = 486472476. Its totient is φ = 92661408.

The previous prime is 231653533. The next prime is 231653551. The reversal of 231653540 is 45356132.

It can be written as a sum of positive squares in 2 ways, for example, as 178275904 + 53377636 = 13352^2 + 7306^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5791319 + ... + 5791358.

It is an arithmetic number, because the mean of its divisors is an integer number (40539373).

Almost surely, 2^231653540 is an apocalyptic number.

231653540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231653540 is an abundant number, since it is smaller than the sum of its proper divisors (254818936).

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

231653540 is a wasteful number, since it uses less digits than its factorization.

231653540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11582686 (or 11582684 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 231653540 is about 15220.1688558307. The cubic root of 231653540 is about 614.1573406574.

The spelling of 231653540 in words is "two hundred thirty-one million, six hundred fifty-three thousand, five hundred forty".