131569691 has 16 divisors (see below), whose sum is σ = 148055040. Its totient is φ = 115895520.

The previous prime is 131569667. The next prime is 131569703. The reversal of 131569691 is 196965131.

It is a cyclic number.

It is not a de Polignac number, because 131569691 - 2¹⁰ = 131568667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131509691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47030 + ... + 49748.

It is an arithmetic number, because the mean of its divisors is an integer number (9253440).

Almost surely, 2^131569691 is an apocalyptic number.

131569691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131569691 is a deficient number, since it is larger than the sum of its proper divisors (16485349).

131569691 is a wasteful number, since it uses less digits than its factorization.

131569691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866.

The product of its digits is 43740, while the sum is 41.

The square root of 131569691 is about 11470.3832106866. The cubic root of 131569691 is about 508.6104568922.

The spelling of 131569691 in words is "one hundred thirty-one million, five hundred sixty-nine thousand, six hundred ninety-one".