131512555 has 4 divisors (see below), whose sum is σ = 157815072. Its totient is φ = 105210040.

The previous prime is 131512531. The next prime is 131512559. The reversal of 131512555 is 555215131.

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

It is not a de Polignac number, because 131512555 - 2⁷ = 131512427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131512559) 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, 13151251 + ... + 13151260.

It is an arithmetic number, because the mean of its divisors is an integer number (39453768).

Almost surely, 2^131512555 is an apocalyptic number.

131512555 is a deficient number, since it is larger than the sum of its proper divisors (26302517).

131512555 is an equidigital number, since it uses as much as digits as its factorization.

131512555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26302516.

The product of its digits is 3750, while the sum is 28.

The square root of 131512555 is about 11467.8923521282. The cubic root of 131512555 is about 508.5368224697.

Adding to 131512555 its reverse (555215131), we get a palindrome (686727686).

The spelling of 131512555 in words is "one hundred thirty-one million, five hundred twelve thousand, five hundred fifty-five".