231375869 has 2 divisors, whose sum is σ = 231375870. Its totient is φ = 231375868.

The previous prime is 231375853. The next prime is 231375871. The reversal of 231375869 is 968573132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190798969 + 40576900 = 13813^2 + 6370^2 .

It is a cyclic number.

It is not a de Polignac number, because 231375869 - 2⁴ = 231375853 is a prime.

It is a super-2 number, since 2×231375869² = 107069585511010322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 231375871, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231375829) 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, 115687934 + 115687935.

It is an arithmetic number, because the mean of its divisors is an integer number (115687935).

Almost surely, 2^231375869 is an apocalyptic number.

It is an amenable number.

231375869 is a deficient number, since it is larger than the sum of its proper divisors (1).

231375869 is an equidigital number, since it uses as much as digits as its factorization.

231375869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 231375869 is about 15211.0443099742. The cubic root of 231375869 is about 613.9118564385.

The spelling of 231375869 in words is "two hundred thirty-one million, three hundred seventy-five thousand, eight hundred sixty-nine".