131278161 has 16 divisors (see below), whose sum is σ = 203324288. Its totient is φ = 73785600.

The previous prime is 131278153. The next prime is 131278207. The reversal of 131278161 is 161872131.

It is not a de Polignac number, because 131278161 - 2³ = 131278153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131278141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49960 + ... + 52521.

It is an arithmetic number, because the mean of its divisors is an integer number (12707768).

Almost surely, 2^131278161 is an apocalyptic number.

It is an amenable number.

131278161 is a deficient number, since it is larger than the sum of its proper divisors (72046127).

131278161 is a wasteful number, since it uses less digits than its factorization.

131278161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102552.

The product of its digits is 2016, while the sum is 30.

The square root of 131278161 is about 11457.6682182720. The cubic root of 131278161 is about 508.2345221420.

The spelling of 131278161 in words is "one hundred thirty-one million, two hundred seventy-eight thousand, one hundred sixty-one".