131097778 has 16 divisors (see below), whose sum is σ = 237959424. Its totient is φ = 52879680.

The previous prime is 131097767. The next prime is 131097781. The reversal of 131097778 is 877790131.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275178 + ... + 275653.

It is an arithmetic number, because the mean of its divisors is an integer number (14872464).

Almost surely, 2^131097778 is an apocalyptic number.

131097778 is a deficient number, since it is larger than the sum of its proper divisors (106861646).

131097778 is a wasteful number, since it uses less digits than its factorization.

131097778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550857.

The product of its (nonzero) digits is 74088, while the sum is 43.

The square root of 131097778 is about 11449.7937972699. The cubic root of 131097778 is about 508.0016352480.

The spelling of 131097778 in words is "one hundred thirty-one million, ninety-seven thousand, seven hundred seventy-eight".