231081142681 has 9 divisors (see below), whose sum is σ = 245482421149. Its totient is φ = 217480442944.

The previous prime is 231081142661. The next prime is 231081142697. The reversal of 231081142681 is 186241180132.

The square root of 231081142681 is 480709.

It is a perfect power (a square), and thus also a powerful number.

231081142681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6575750281 + 224505392400 = 81091^2 + 473820^2 .

It is not a de Polignac number, because 231081142681 - 2²⁵ = 231047588249 is a prime.

It is a super-2 number, since 2×231081142681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231081142681.

It is not an unprimeable number, because it can be changed into a prime (231081142631) 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 in 8 ways as a sum of consecutive naturals, for example, 8157915 + ... + 8186191.

Almost surely, 2^231081142681 is an apocalyptic number.

231081142681 is the 480709-th square number.

231081142681 is the 240355-th centered octagonal number.

It is an amenable number.

231081142681 is a deficient number, since it is larger than the sum of its proper divisors (14401278468).

231081142681 is an frugal number, since it uses more digits than its factorization.

231081142681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56588 (or 28294 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The spelling of 231081142681 in words is "two hundred thirty-one billion, eighty-one million, one hundred forty-two thousand, six hundred eighty-one".