231941563081 has 2 divisors, whose sum is σ = 231941563082. Its totient is φ = 231941563080.

The previous prime is 231941563037. The next prime is 231941563099. The reversal of 231941563081 is 180365149132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163653420681 + 68288142400 = 404541^2 + 261320^2 .

It is a cyclic number.

It is not a de Polignac number, because 231941563081 - 2⁹ = 231941562569 is a prime.

It is a super-2 number, since 2×231941563081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231941543081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115970781540 + 115970781541.

It is an arithmetic number, because the mean of its divisors is an integer number (115970781541).

Almost surely, 2^231941563081 is an apocalyptic number.

It is an amenable number.

231941563081 is a deficient number, since it is larger than the sum of its proper divisors (1).

231941563081 is an equidigital number, since it uses as much as digits as its factorization.

231941563081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 231941563081 in words is "two hundred thirty-one billion, nine hundred forty-one million, five hundred sixty-three thousand, eighty-one".