231550313 has 4 divisors (see below), whose sum is σ = 236935248. Its totient is φ = 226165380.

The previous prime is 231550309. The next prime is 231550331. The reversal of 231550313 is 313055132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231550313 - 2² = 231550309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231550393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2692403 + ... + 2692488.

It is an arithmetic number, because the mean of its divisors is an integer number (59233812).

Almost surely, 2^231550313 is an apocalyptic number.

It is an amenable number.

231550313 is a deficient number, since it is larger than the sum of its proper divisors (5384935).

231550313 is an equidigital number, since it uses as much as digits as its factorization.

231550313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5384934.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 231550313 is about 15216.7773526460. Note that the first 3 decimals coincide. The cubic root of 231550313 is about 614.0661023380.

The spelling of 231550313 in words is "two hundred thirty-one million, five hundred fifty thousand, three hundred thirteen".