231736813 has 16 divisors (see below), whose sum is σ = 290404224. Its totient is φ = 179645760.

The previous prime is 231736807. The next prime is 231736819. The reversal of 231736813 is 318637132.

231736813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231736807) and next prime (231736819).

It is not a de Polignac number, because 231736813 - 2¹⁷ = 231605741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231736819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7531 + ... + 22807.

It is an arithmetic number, because the mean of its divisors is an integer number (18150264).

Almost surely, 2^231736813 is an apocalyptic number.

It is an amenable number.

231736813 is a deficient number, since it is larger than the sum of its proper divisors (58667411).

231736813 is a wasteful number, since it uses less digits than its factorization.

231736813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15492.

The product of its digits is 18144, while the sum is 34.

The square root of 231736813 is about 15222.9042235705. The cubic root of 231736813 is about 614.2309226645.

The spelling of 231736813 in words is "two hundred thirty-one million, seven hundred thirty-six thousand, eight hundred thirteen".