131546531 has 4 divisors (see below), whose sum is σ = 132121200. Its totient is φ = 130971864.

The previous prime is 131546521. The next prime is 131546543. The reversal of 131546531 is 135645131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131546531 is a prime.

It is a super-2 number, since 2×131546531² = 34608979636267922, 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 = 131546494 and 131546503.

It is not an unprimeable number, because it can be changed into a prime (131546521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286991 + ... + 287448.

It is an arithmetic number, because the mean of its divisors is an integer number (33030300).

Almost surely, 2^131546531 is an apocalyptic number.

131546531 is a deficient number, since it is larger than the sum of its proper divisors (574669).

131546531 is an equidigital number, since it uses as much as digits as its factorization.

131546531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574668.

The product of its digits is 5400, while the sum is 29.

The square root of 131546531 is about 11469.3736097487. The cubic root of 131546531 is about 508.5806118488.

The spelling of 131546531 in words is "one hundred thirty-one million, five hundred forty-six thousand, five hundred thirty-one".