131540555 has 4 divisors (see below), whose sum is σ = 157848672. Its totient is φ = 105232440.

The previous prime is 131540551. The next prime is 131540573. The reversal of 131540555 is 555045131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555045131 = 23 ⋅24132397.

It is not a de Polignac number, because 131540555 - 2² = 131540551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131540551) 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, 13154051 + ... + 13154060.

It is an arithmetic number, because the mean of its divisors is an integer number (39462168).

Almost surely, 2^131540555 is an apocalyptic number.

131540555 is a deficient number, since it is larger than the sum of its proper divisors (26308117).

131540555 is an equidigital number, since it uses as much as digits as its factorization.

131540555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26308116.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 131540555 is about 11469.1130868956. The cubic root of 131540555 is about 508.5729103312.

Adding to 131540555 its reverse (555045131), we get a palindrome (686585686).

The spelling of 131540555 in words is "one hundred thirty-one million, five hundred forty thousand, five hundred fifty-five".