131240556 has 18 divisors (see below), whose sum is σ = 331747052. Its totient is φ = 43746840.

The previous prime is 131240537. The next prime is 131240563. The reversal of 131240556 is 655042131.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1822750 + ... + 1822821.

Almost surely, 2^131240556 is an apocalyptic number.

It is an amenable number.

131240556 is an abundant number, since it is smaller than the sum of its proper divisors (200506496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131240556 is a wasteful number, since it uses less digits than its factorization.

131240556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645581 (or 3645576 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 131240556 is about 11456.0270600239. The cubic root of 131240556 is about 508.1859891028.

Adding to 131240556 its reverse (655042131), we get a palindrome (786282687).

The spelling of 131240556 in words is "one hundred thirty-one million, two hundred forty thousand, five hundred fifty-six".