131656531 has 4 divisors (see below), whose sum is σ = 137380752. Its totient is φ = 125932312.

The previous prime is 131656519. The next prime is 131656537. The reversal of 131656531 is 135656131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131656531 - 2¹¹ = 131654483 is a prime.

It is a super-2 number, since 2×131656531² = 34666884309907922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131656493 and 131656502.

It is not an unprimeable number, because it can be changed into a prime (131656537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862076 + ... + 2862121.

It is an arithmetic number, because the mean of its divisors is an integer number (34345188).

Almost surely, 2^131656531 is an apocalyptic number.

131656531 is a deficient number, since it is larger than the sum of its proper divisors (5724221).

131656531 is an equidigital number, since it uses as much as digits as its factorization.

131656531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724220.

The product of its digits is 8100, while the sum is 31.

The square root of 131656531 is about 11474.1679872660. The cubic root of 131656531 is about 508.7223317421.

The spelling of 131656531 in words is "one hundred thirty-one million, six hundred fifty-six thousand, five hundred thirty-one".