231956369 has 2 divisors, whose sum is σ = 231956370. Its totient is φ = 231956368.

The previous prime is 231956323. The next prime is 231956371. The reversal of 231956369 is 963659132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187333969 + 44622400 = 13687^2 + 6680^2 .

It is a cyclic number.

It is not a de Polignac number, because 231956369 - 2²⁰ = 230907793 is a prime.

It is a super-2 number, since 2×231956369² = 107607514239328322, which contains 22 as substring.

Together with 231956371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231956399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115978184 + 115978185.

It is an arithmetic number, because the mean of its divisors is an integer number (115978185).

Almost surely, 2^231956369 is an apocalyptic number.

It is an amenable number.

231956369 is a deficient number, since it is larger than the sum of its proper divisors (1).

231956369 is an equidigital number, since it uses as much as digits as its factorization.

231956369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 44.

The square root of 231956369 is about 15230.1138866392. The cubic root of 231956369 is about 614.4248431086.

The spelling of 231956369 in words is "two hundred thirty-one million, nine hundred fifty-six thousand, three hundred sixty-nine".