231261313 has 4 divisors (see below), whose sum is σ = 235624788. Its totient is φ = 226897840.

The previous prime is 231261311. The next prime is 231261367. The reversal of 231261313 is 313162132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165456769 + 65804544 = 12863^2 + 8112^2 .

It is a cyclic number.

It is not a de Polignac number, because 231261313 - 2¹ = 231261311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231261311) 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 3 ways as a sum of consecutive naturals, for example, 2181658 + ... + 2181763.

It is an arithmetic number, because the mean of its divisors is an integer number (58906197).

Almost surely, 2^231261313 is an apocalyptic number.

It is an amenable number.

231261313 is a deficient number, since it is larger than the sum of its proper divisors (4363475).

231261313 is an equidigital number, since it uses as much as digits as its factorization.

231261313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363474.

The product of its digits is 648, while the sum is 22.

The square root of 231261313 is about 15207.2782903451. The cubic root of 231261313 is about 613.8105221944.

The spelling of 231261313 in words is "two hundred thirty-one million, two hundred sixty-one thousand, three hundred thirteen".