131521218797 has 2 divisors, whose sum is σ = 131521218798. Its totient is φ = 131521218796.

The previous prime is 131521218781. The next prime is 131521218817. The reversal of 131521218797 is 797812125131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122296384681 + 9224834116 = 349709^2 + 96046^2 .

It is a cyclic number.

It is not a de Polignac number, because 131521218797 - 2⁴ = 131521218781 is a prime.

It is a super-2 number, since 2×131521218797² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131521218727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65760609398 + 65760609399.

It is an arithmetic number, because the mean of its divisors is an integer number (65760609399).

Almost surely, 2^131521218797 is an apocalyptic number.

It is an amenable number.

131521218797 is a deficient number, since it is larger than the sum of its proper divisors (1).

131521218797 is an equidigital number, since it uses as much as digits as its factorization.

131521218797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 47.

The spelling of 131521218797 in words is "one hundred thirty-one billion, five hundred twenty-one million, two hundred eighteen thousand, seven hundred ninety-seven".