131031478845 has 64 divisors (see below), whose sum is σ = 236855174400. Its totient is φ = 68716200960.

The previous prime is 131031478819. The next prime is 131031478849. The reversal of 131031478845 is 548874130131.

131031478845 is a `hidden beast` number, since 131 + 0 + 3 + 1 + 478 + 8 + 45 = 666.

It is not a de Polignac number, because 131031478845 - 2¹³ = 131031470653 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 131031478845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131031478849) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3241921 + ... + 3282089.

It is an arithmetic number, because the mean of its divisors is an integer number (3700862100).

Almost surely, 2^131031478845 is an apocalyptic number.

131031478845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131031478845 is a deficient number, since it is larger than the sum of its proper divisors (105823695555).

131031478845 is a wasteful number, since it uses less digits than its factorization.

131031478845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40587 (or 40581 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 131031478845 in words is "one hundred thirty-one billion, thirty-one million, four hundred seventy-eight thousand, eight hundred forty-five".