131131555 has 4 divisors (see below), whose sum is σ = 157357872. Its totient is φ = 104905240.

The previous prime is 131131543. The next prime is 131131577. The reversal of 131131555 is 555131131.

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: 555131131 = 9311 ⋅59621.

It is not a de Polignac number, because 131131555 - 2⁹ = 131131043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13113151 + ... + 13113160.

It is an arithmetic number, because the mean of its divisors is an integer number (39339468).

Almost surely, 2^131131555 is an apocalyptic number.

131131555 is a deficient number, since it is larger than the sum of its proper divisors (26226317).

131131555 is an equidigital number, since it uses as much as digits as its factorization.

131131555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26226316.

The product of its digits is 1125, while the sum is 25.

The square root of 131131555 is about 11451.2687070036. The cubic root of 131131555 is about 508.0452599330.

Adding to 131131555 its reverse (555131131), we get a palindrome (686262686).

The spelling of 131131555 in words is "one hundred thirty-one million, one hundred thirty-one thousand, five hundred fifty-five".