131329978 has 16 divisors (see below), whose sum is σ = 215139456. Its totient is φ = 59759280.

The previous prime is 131329963. The next prime is 131329999. The reversal of 131329978 is 879923131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33726 + ... + 37417.

It is an arithmetic number, because the mean of its divisors is an integer number (13446216).

Almost surely, 2^131329978 is an apocalyptic number.

131329978 is a deficient number, since it is larger than the sum of its proper divisors (83809478).

131329978 is a wasteful number, since it uses less digits than its factorization.

131329978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71229.

The product of its digits is 81648, while the sum is 43.

The square root of 131329978 is about 11459.9292318932. The cubic root of 131329978 is about 508.3013820163.

The spelling of 131329978 in words is "one hundred thirty-one million, three hundred twenty-nine thousand, nine hundred seventy-eight".