131531728477 has 2 divisors, whose sum is σ = 131531728478. Its totient is φ = 131531728476.

The previous prime is 131531728439. The next prime is 131531728511. The reversal of 131531728477 is 774827135131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69617350201 + 61914378276 = 263851^2 + 248826^2 .

It is a cyclic number.

It is not a de Polignac number, because 131531728477 - 2²³ = 131523339869 is a prime.

It is a super-2 number, since 2×131531728477² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131531728477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131531728877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65765864238 + 65765864239.

It is an arithmetic number, because the mean of its divisors is an integer number (65765864239).

Almost surely, 2^131531728477 is an apocalyptic number.

It is an amenable number.

131531728477 is a deficient number, since it is larger than the sum of its proper divisors (1).

131531728477 is an equidigital number, since it uses as much as digits as its factorization.

131531728477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 49.

The spelling of 131531728477 in words is "one hundred thirty-one billion, five hundred thirty-one million, seven hundred twenty-eight thousand, four hundred seventy-seven".