231313540 has 24 divisors (see below), whose sum is σ = 489309912. Its totient is φ = 91848960.

The previous prime is 231313531. The next prime is 231313549. The reversal of 231313540 is 45313132.

It is an interprime number because it is at equal distance from previous prime (231313531) and next prime (231313549).

It can be written as a sum of positive squares in 4 ways, for example, as 85821696 + 145491844 = 9264^2 + 12062^2 .

It is not an unprimeable number, because it can be changed into a prime (231313549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39471 + ... + 44950.

It is an arithmetic number, because the mean of its divisors is an integer number (20387913).

Almost surely, 2^231313540 is an apocalyptic number.

231313540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231313540 is an abundant number, since it is smaller than the sum of its proper divisors (257996372).

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

231313540 is a wasteful number, since it uses less digits than its factorization.

231313540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84567 (or 84565 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 231313540 is about 15208.9953645861. The cubic root of 231313540 is about 613.8567254393.

Adding to 231313540 its reverse (45313132), we get a palindrome (276626672).

The spelling of 231313540 in words is "two hundred thirty-one million, three hundred thirteen thousand, five hundred forty".