131093581 has 2 divisors, whose sum is σ = 131093582. Its totient is φ = 131093580.

The previous prime is 131093531. The next prime is 131093621. The reversal of 131093581 is 185390131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111112681 + 19980900 = 10541^2 + 4470^2 .

It is a cyclic number.

It is not a de Polignac number, because 131093581 - 2¹⁹ = 130569293 is a prime.

It is a super-2 number, since 2×131093581² = 34371053958807122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131093531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65546790 + 65546791.

It is an arithmetic number, because the mean of its divisors is an integer number (65546791).

Almost surely, 2^131093581 is an apocalyptic number.

It is an amenable number.

131093581 is a deficient number, since it is larger than the sum of its proper divisors (1).

131093581 is an equidigital number, since it uses as much as digits as its factorization.

131093581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 131093581 is about 11449.6105173932. The cubic root of 131093581 is about 507.9962140892.

The spelling of 131093581 in words is "one hundred thirty-one million, ninety-three thousand, five hundred eighty-one".