131537556 has 18 divisors (see below), whose sum is σ = 332497802. Its totient is φ = 43845840.

The previous prime is 131537543. The next prime is 131537563. The reversal of 131537556 is 655735131.

It can be written as a sum of positive squares in only one way, i.e., 91011600 + 40525956 = 9540^2 + 6366^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3653821 = 131537556 / (1 + 3 + 1 + 5 + 3 + 7 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 131537556.

It is a congruent number.

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, 1826875 + ... + 1826946.

Almost surely, 2^131537556 is an apocalyptic number.

It is an amenable number.

131537556 is an abundant number, since it is smaller than the sum of its proper divisors (200960246).

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

131537556 is a wasteful number, since it uses less digits than its factorization.

131537556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653831 (or 3653826 counting only the distinct ones).

The product of its digits is 47250, while the sum is 36.

The square root of 131537556 is about 11468.9823436955. The cubic root of 131537556 is about 508.5690453084.

The spelling of 131537556 in words is "one hundred thirty-one million, five hundred thirty-seven thousand, five hundred fifty-six".