131803691 has 4 divisors (see below), whose sum is σ = 132384552. Its totient is φ = 131222832.

The previous prime is 131803681. The next prime is 131803709. The reversal of 131803691 is 196308131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196308131 = 53 ⋅3703927.

It is a cyclic number.

It is not a de Polignac number, because 131803691 - 2¹⁰ = 131802667 is a prime.

It is a super-2 number, since 2×131803691² = 34744425922446962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131803621) 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, 290090 + ... + 290543.

It is an arithmetic number, because the mean of its divisors is an integer number (33096138).

Almost surely, 2^131803691 is an apocalyptic number.

131803691 is a deficient number, since it is larger than the sum of its proper divisors (580861).

131803691 is an equidigital number, since it uses as much as digits as its factorization.

131803691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580860.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 131803691 is about 11480.5788617125. The cubic root of 131803691 is about 508.9118038024.

The spelling of 131803691 in words is "one hundred thirty-one million, eight hundred three thousand, six hundred ninety-one".