131581633549 has 2 divisors, whose sum is σ = 131581633550. Its totient is φ = 131581633548.

The previous prime is 131581633541. The next prime is 131581633567. The reversal of 131581633549 is 945336185131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108097603524 + 23484030025 = 328782^2 + 153245^2 .

It is a cyclic number.

It is not a de Polignac number, because 131581633549 - 2³ = 131581633541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131581633541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65790816774 + 65790816775.

It is an arithmetic number, because the mean of its divisors is an integer number (65790816775).

Almost surely, 2^131581633549 is an apocalyptic number.

It is an amenable number.

131581633549 is a deficient number, since it is larger than the sum of its proper divisors (1).

131581633549 is an equidigital number, since it uses as much as digits as its factorization.

131581633549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 49.

The spelling of 131581633549 in words is "one hundred thirty-one billion, five hundred eighty-one million, six hundred thirty-three thousand, five hundred forty-nine".