131264616521 has 2 divisors, whose sum is σ = 131264616522. Its totient is φ = 131264616520.

The previous prime is 131264616517. The next prime is 131264616547. The reversal of 131264616521 is 125616462131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131233032121 + 31584400 = 362261^2 + 5620^2 .

It is a cyclic number.

It is not a de Polignac number, because 131264616521 - 2² = 131264616517 is a prime.

It is a super-2 number, since 2×131264616521² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131264616121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65632308260 + 65632308261.

It is an arithmetic number, because the mean of its divisors is an integer number (65632308261).

Almost surely, 2^131264616521 is an apocalyptic number.

It is an amenable number.

131264616521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131264616521 is an equidigital number, since it uses as much as digits as its factorization.

131264616521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The spelling of 131264616521 in words is "one hundred thirty-one billion, two hundred sixty-four million, six hundred sixteen thousand, five hundred twenty-one".