131942531 has 4 divisors (see below), whose sum is σ = 150791472. Its totient is φ = 113093592.

The previous prime is 131942521. The next prime is 131942539. The reversal of 131942531 is 135249131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135249131 = 23 ⋅5880397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131942531 is a prime.

It is a super-2 number, since 2×131942531² = 34817662973371922, 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 = 131942494 and 131942503.

It is not an unprimeable number, because it can be changed into a prime (131942539) 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, 9424460 + ... + 9424473.

It is an arithmetic number, because the mean of its divisors is an integer number (37697868).

Almost surely, 2^131942531 is an apocalyptic number.

131942531 is a deficient number, since it is larger than the sum of its proper divisors (18848941).

131942531 is an equidigital number, since it uses as much as digits as its factorization.

131942531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18848940.

The product of its digits is 3240, while the sum is 29.

The square root of 131942531 is about 11486.6240035965. The cubic root of 131942531 is about 509.0904344084.

The spelling of 131942531 in words is "one hundred thirty-one million, nine hundred forty-two thousand, five hundred thirty-one".