131606531 has 16 divisors (see below), whose sum is σ = 154387200. Its totient is φ = 109837728.

The previous prime is 131606513. The next prime is 131606539. The reversal of 131606531 is 135606131.

It is a de Polignac number, because none of the positive numbers 2^k-131606531 is a prime.

It is a super-2 number, since 2×131606531² = 34640558003707922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131606531.

It is not an unprimeable number, because it can be changed into a prime (131606539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152780 + ... + 153638.

It is an arithmetic number, because the mean of its divisors is an integer number (9649200).

Almost surely, 2^131606531 is an apocalyptic number.

131606531 is a deficient number, since it is larger than the sum of its proper divisors (22780669).

131606531 is an equidigital number, since it uses as much as digits as its factorization.

131606531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 131606531 is about 11471.9889731467. The cubic root of 131606531 is about 508.6579233985.

It can be divided in two parts, 13160 and 6531, that added together give a palindrome (19691).

The spelling of 131606531 in words is "one hundred thirty-one million, six hundred six thousand, five hundred thirty-one".