231071432981 has 2 divisors, whose sum is σ = 231071432982. Its totient is φ = 231071432980.

The previous prime is 231071432959. The next prime is 231071433007. The reversal of 231071432981 is 189234170132.

It is a happy number.

231071432981 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., 195107724100 + 35963708881 = 441710^2 + 189641^2 .

It is a cyclic number.

It is not a de Polignac number, because 231071432981 - 2¹⁰ = 231071431957 is a prime.

It is a super-2 number, since 2×231071432981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231071432941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115535716490 + 115535716491.

It is an arithmetic number, because the mean of its divisors is an integer number (115535716491).

Almost surely, 2^231071432981 is an apocalyptic number.

It is an amenable number.

231071432981 is a deficient number, since it is larger than the sum of its proper divisors (1).

231071432981 is an equidigital number, since it uses as much as digits as its factorization.

231071432981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 231071432981 in words is "two hundred thirty-one billion, seventy-one million, four hundred thirty-two thousand, nine hundred eighty-one".