231809957 has 2 divisors, whose sum is σ = 231809958. Its totient is φ = 231809956.

The previous prime is 231809933. The next prime is 231809983. The reversal of 231809957 is 759908132.

231809957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218625796 + 13184161 = 14786^2 + 3631^2 .

It is a cyclic number.

It is not a de Polignac number, because 231809957 - 2¹⁰ = 231808933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231809987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115904978 + 115904979.

It is an arithmetic number, because the mean of its divisors is an integer number (115904979).

Almost surely, 2^231809957 is an apocalyptic number.

It is an amenable number.

231809957 is a deficient number, since it is larger than the sum of its proper divisors (1).

231809957 is an equidigital number, since it uses as much as digits as its factorization.

231809957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 231809957 is about 15225.3064665379. The cubic root of 231809957 is about 614.2955399057.

The spelling of 231809957 in words is "two hundred thirty-one million, eight hundred nine thousand, nine hundred fifty-seven".