131591569 has 2 divisors, whose sum is σ = 131591570. Its totient is φ = 131591568.

The previous prime is 131591563. The next prime is 131591597. The reversal of 131591569 is 965195131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131217025 + 374544 = 11455^2 + 612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131591569 is a prime.

It is a super-2 number, since 2×131591569² = 34632682063763522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131591563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65795784 + 65795785.

It is an arithmetic number, because the mean of its divisors is an integer number (65795785).

Almost surely, 2^131591569 is an apocalyptic number.

It is an amenable number.

131591569 is a deficient number, since it is larger than the sum of its proper divisors (1).

131591569 is an equidigital number, since it uses as much as digits as its factorization.

131591569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450, while the sum is 40.

The square root of 131591569 is about 11471.3368445007. The cubic root of 131591569 is about 508.6386466746.

The spelling of 131591569 in words is "one hundred thirty-one million, five hundred ninety-one thousand, five hundred sixty-nine".