131631432761 has 2 divisors, whose sum is σ = 131631432762. Its totient is φ = 131631432760.

The previous prime is 131631432739. The next prime is 131631432809. The reversal of 131631432761 is 167234136131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130375155625 + 1256277136 = 361075^2 + 35444^2 .

It is a cyclic number.

It is not a de Polignac number, because 131631432761 - 2⁶ = 131631432697 is a prime.

It is not a weakly prime, because it can be changed into another prime (131631434761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65815716380 + 65815716381.

It is an arithmetic number, because the mean of its divisors is an integer number (65815716381).

Almost surely, 2^131631432761 is an apocalyptic number.

It is an amenable number.

131631432761 is a deficient number, since it is larger than the sum of its proper divisors (1).

131631432761 is an equidigital number, since it uses as much as digits as its factorization.

131631432761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

Adding to 131631432761 its reverse (167234136131), we get a palindrome (298865568892).

The spelling of 131631432761 in words is "one hundred thirty-one billion, six hundred thirty-one million, four hundred thirty-two thousand, seven hundred sixty-one".