131278157 has 4 divisors (see below), whose sum is σ = 135805020. Its totient is φ = 126751296.

The previous prime is 131278153. The next prime is 131278207. The reversal of 131278157 is 751872131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751872131 = 127 ⋅5920253.

It can be written as a sum of positive squares in 2 ways, for example, as 110901961 + 20376196 = 10531^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 131278157 - 2² = 131278153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131278153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2263388 + ... + 2263445.

It is an arithmetic number, because the mean of its divisors is an integer number (33951255).

Almost surely, 2^131278157 is an apocalyptic number.

It is an amenable number.

131278157 is a deficient number, since it is larger than the sum of its proper divisors (4526863).

131278157 is an equidigital number, since it uses as much as digits as its factorization.

131278157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4526862.

The product of its digits is 11760, while the sum is 35.

The square root of 131278157 is about 11457.6680437164. The cubic root of 131278157 is about 508.2345169801.

The spelling of 131278157 in words is "one hundred thirty-one million, two hundred seventy-eight thousand, one hundred fifty-seven".