131556 has 24 divisors (see below), whose sum is σ = 323680. Its totient is φ = 41472.

The previous prime is 131543. The next prime is 131561. The reversal of 131556 is 655131.

It is a happy number.

It is a super-2 number, since 2×131556² = 34613962272, which contains 22 as substring.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 131556.

It is an unprimeable number.

131556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61 + ... + 516.

2¹³¹⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

131556 is an abundant number, since it is smaller than the sum of its proper divisors (192124).

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

131556 is a wasteful number, since it uses less digits than its factorization.

131556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603 (or 601 counting only the distinct ones).

The product of its digits is 450, while the sum is 21.

The square root of 131556 is about 362.7064929113. The cubic root of 131556 is about 50.8592814462.

Adding to 131556 its reverse (655131), we get a palindrome (786687).

The spelling of 131556 in words is "one hundred thirty-one thousand, five hundred fifty-six".