231512801281 has 2 divisors, whose sum is σ = 231512801282. Its totient is φ = 231512801280.

The previous prime is 231512801257. The next prime is 231512801329. The reversal of 231512801281 is 182108215132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145790330625 + 85722470656 = 381825^2 + 292784^2 .

It is a cyclic number.

It is not a de Polignac number, because 231512801281 - 2¹⁷ = 231512670209 is a prime.

It is a super-2 number, since 2×231512801281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231512801231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115756400640 + 115756400641.

It is an arithmetic number, because the mean of its divisors is an integer number (115756400641).

Almost surely, 2^231512801281 is an apocalyptic number.

It is an amenable number.

231512801281 is a deficient number, since it is larger than the sum of its proper divisors (1).

231512801281 is an equidigital number, since it uses as much as digits as its factorization.

231512801281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 34.

The spelling of 231512801281 in words is "two hundred thirty-one billion, five hundred twelve million, eight hundred one thousand, two hundred eighty-one".