131813661 has 8 divisors (see below), whose sum is σ = 200858944. Its totient is φ = 75322080.

The previous prime is 131813657. The next prime is 131813677. The reversal of 131813661 is 166318131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131813661 - 2² = 131813657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131813651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3138400 + ... + 3138441.

It is an arithmetic number, because the mean of its divisors is an integer number (25107368).

Almost surely, 2^131813661 is an apocalyptic number.

It is an amenable number.

131813661 is a deficient number, since it is larger than the sum of its proper divisors (69045283).

131813661 is an equidigital number, since it uses as much as digits as its factorization.

131813661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6276851.

The product of its digits is 2592, while the sum is 30.

The square root of 131813661 is about 11481.0130650566. The cubic root of 131813661 is about 508.9246353165.

The spelling of 131813661 in words is "one hundred thirty-one million, eight hundred thirteen thousand, six hundred sixty-one".