331385441977397 has 2 divisors, whose sum is σ = 331385441977398. Its totient is φ = 331385441977396.

The previous prime is 331385441977391. The next prime is 331385441977409. The reversal of 331385441977397 is 793779144583133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223212982418596 + 108172459558801 = 14940314^2 + 10400599^2 .

It is a cyclic number.

It is not a de Polignac number, because 331385441977397 - 2⁶ = 331385441977333 is a prime.

It is a super-2 number, since 2×331385441977397² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331385441977391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165692720988698 + 165692720988699.

It is an arithmetic number, because the mean of its divisors is an integer number (165692720988699).

Almost surely, 2^{331385441977397} is an apocalyptic number.

It is an amenable number.

331385441977397 is a deficient number, since it is larger than the sum of its proper divisors (1).

331385441977397 is an equidigital number, since it uses as much as digits as its factorization.

331385441977397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440270720, while the sum is 74.

The spelling of 331385441977397 in words is "three hundred thirty-one trillion, three hundred eighty-five billion, four hundred forty-one million, nine hundred seventy-seven thousand, three hundred ninety-seven".