131157506 has 4 divisors (see below), whose sum is σ = 196736262. Its totient is φ = 65578752.

The previous prime is 131157493. The next prime is 131157511. The reversal of 131157506 is 605751131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 82646281 + 48511225 = 9091^2 + 6965^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32789375 + ... + 32789378.

Almost surely, 2^131157506 is an apocalyptic number.

131157506 is a deficient number, since it is larger than the sum of its proper divisors (65578756).

131157506 is an equidigital number, since it uses as much as digits as its factorization.

131157506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65578755.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 131157506 is about 11452.4017568369. The cubic root of 131157506 is about 508.0787718590.

The spelling of 131157506 in words is "one hundred thirty-one million, one hundred fifty-seven thousand, five hundred six".