331149198521 has 2 divisors, whose sum is σ = 331149198522. Its totient is φ = 331149198520.

The previous prime is 331149198509. The next prime is 331149198529. The reversal of 331149198521 is 125891941133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 325424611600 + 5724586921 = 570460^2 + 75661^2 .

It is a cyclic number.

It is not a de Polignac number, because 331149198521 - 2¹⁰ = 331149197497 is a prime.

It is a super-2 number, since 2×331149198521² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331149198529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165574599260 + 165574599261.

It is an arithmetic number, because the mean of its divisors is an integer number (165574599261).

Almost surely, 2^331149198521 is an apocalyptic number.

It is an amenable number.

331149198521 is a deficient number, since it is larger than the sum of its proper divisors (1).

331149198521 is an equidigital number, since it uses as much as digits as its factorization.

331149198521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The spelling of 331149198521 in words is "three hundred thirty-one billion, one hundred forty-nine million, one hundred ninety-eight thousand, five hundred twenty-one".