231550513 has 4 divisors (see below), whose sum is σ = 231640128. Its totient is φ = 231460900.

The previous prime is 231550441. The next prime is 231550519. The reversal of 231550513 is 315055132.

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 a cyclic number.

It is not a de Polignac number, because 231550513 - 2²¹ = 229453361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231550519) 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, 40813 + ... + 46138.

It is an arithmetic number, because the mean of its divisors is an integer number (57910032).

Almost surely, 2^231550513 is an apocalyptic number.

It is an amenable number.

231550513 is a deficient number, since it is larger than the sum of its proper divisors (89615).

231550513 is an equidigital number, since it uses as much as digits as its factorization.

231550513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89614.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 231550513 is about 15216.7839243383. The cubic root of 231550513 is about 614.0662791364.

The spelling of 231550513 in words is "two hundred thirty-one million, five hundred fifty thousand, five hundred thirteen".