131445540681 has 32 divisors (see below), whose sum is σ = 215857302528. Its totient is φ = 69285119040.

The previous prime is 131445540671. The next prime is 131445540683. The reversal of 131445540681 is 186045544131.

It is not a de Polignac number, because 131445540681 - 2¹¹ = 131445538633 is a prime.

It is a super-2 number, since 2×131445540681² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131445540683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220866 + ... + 558276.

It is an arithmetic number, because the mean of its divisors is an integer number (6745540704).

Almost surely, 2^131445540681 is an apocalyptic number.

It is an amenable number.

131445540681 is a deficient number, since it is larger than the sum of its proper divisors (84411761847).

131445540681 is a wasteful number, since it uses less digits than its factorization.

131445540681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338861.

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 131445540681 in words is "one hundred thirty-one billion, four hundred forty-five million, five hundred forty thousand, six hundred eighty-one".