1980914931397 has 2 divisors, whose sum is σ = 1980914931398. Its totient is φ = 1980914931396.

The previous prime is 1980914931389. The next prime is 1980914931421. The reversal of 1980914931397 is 7931394190891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1966190079681 + 14724851716 = 1402209^2 + 121346^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980914931397 - 2³ = 1980914931389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980914932397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990457465698 + 990457465699.

It is an arithmetic number, because the mean of its divisors is an integer number (990457465699).

Almost surely, 2^{1980914931397} is an apocalyptic number.

It is an amenable number.

1980914931397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980914931397 is an equidigital number, since it uses as much as digits as its factorization.

1980914931397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13226976, while the sum is 64.

The spelling of 1980914931397 in words is "one trillion, nine hundred eighty billion, nine hundred fourteen million, nine hundred thirty-one thousand, three hundred ninety-seven".