131557145 has 4 divisors (see below), whose sum is σ = 157868580. Its totient is φ = 105245712.

The previous prime is 131557103. The next prime is 131557187. The reversal of 131557145 is 541755131.

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

It is an interprime number because it is at equal distance from previous prime (131557103) and next prime (131557187).

It can be written as a sum of positive squares in 2 ways, for example, as 62932489 + 68624656 = 7933^2 + 8284^2 .

It is a cyclic number.

It is not a de Polignac number, because 131557145 - 2⁸ = 131556889 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13155710 + ... + 13155719.

It is an arithmetic number, because the mean of its divisors is an integer number (39467145).

Almost surely, 2^131557145 is an apocalyptic number.

It is an amenable number.

131557145 is a deficient number, since it is larger than the sum of its proper divisors (26311435).

131557145 is an equidigital number, since it uses as much as digits as its factorization.

131557145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26311434.

The product of its digits is 10500, while the sum is 32.

The square root of 131557145 is about 11469.8363109506. The cubic root of 131557145 is about 508.5942899732.

The spelling of 131557145 in words is "one hundred thirty-one million, five hundred fifty-seven thousand, one hundred forty-five".