131371978 has 12 divisors (see below), whose sum is σ = 202532022. Its totient is φ = 63909360.

The previous prime is 131371951. The next prime is 131371987. The reversal of 131371978 is 879173131.

It can be written as a sum of positive squares in 3 ways, for example, as 130804969 + 567009 = 11437^2 + 753^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131371978.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21253 + ... + 26728.

Almost surely, 2^131371978 is an apocalyptic number.

131371978 is a deficient number, since it is larger than the sum of its proper divisors (71160044).

131371978 is an equidigital number, since it uses as much as digits as its factorization.

131371978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48057 (or 48020 counting only the distinct ones).

The product of its digits is 31752, while the sum is 40.

The square root of 131371978 is about 11461.7615574570. The cubic root of 131371978 is about 508.3555620367.

The spelling of 131371978 in words is "one hundred thirty-one million, three hundred seventy-one thousand, nine hundred seventy-eight".