231581356082081 has 16 divisors (see below), whose sum is σ = 234273197894400. Its totient is φ = 228904237231488.

The previous prime is 231581356082071. The next prime is 231581356082129. The reversal of 231581356082081 is 180280653185132.

It is a cyclic number.

It is not a de Polignac number, because 231581356082081 - 2²² = 231581351887777 is a prime.

It is a super-2 number, since 2×231581356082081² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231581356082071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304883675 + ... + 305642303.

It is an arithmetic number, because the mean of its divisors is an integer number (14642074868400).

Almost surely, 2^{231581356082081} is an apocalyptic number.

It is an amenable number.

231581356082081 is a deficient number, since it is larger than the sum of its proper divisors (2691841812319).

231581356082081 is a wasteful number, since it uses less digits than its factorization.

231581356082081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768328.

The product of its (nonzero) digits is 2764800, while the sum is 53.

The spelling of 231581356082081 in words is "two hundred thirty-one trillion, five hundred eighty-one billion, three hundred fifty-six million, eighty-two thousand, eighty-one".