131581633541 has 2 divisors, whose sum is σ = 131581633542. Its totient is φ = 131581633540.

The previous prime is 131581633537. The next prime is 131581633549. The reversal of 131581633541 is 145336185131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119886292516 + 11695341025 = 346246^2 + 108145^2 .

It is a cyclic number.

It is not a de Polignac number, because 131581633541 - 2² = 131581633537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131581633549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65790816770 + 65790816771.

It is an arithmetic number, because the mean of its divisors is an integer number (65790816771).

Almost surely, 2^131581633541 is an apocalyptic number.

It is an amenable number.

131581633541 is a deficient number, since it is larger than the sum of its proper divisors (1).

131581633541 is an equidigital number, since it uses as much as digits as its factorization.

131581633541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The spelling of 131581633541 in words is "one hundred thirty-one billion, five hundred eighty-one million, six hundred thirty-three thousand, five hundred forty-one".