397774795321 has 2 divisors, whose sum is σ = 397774795322. Its totient is φ = 397774795320.

The previous prime is 397774795277. The next prime is 397774795387. The reversal of 397774795321 is 123597477793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310120903225 + 87653892096 = 556885^2 + 296064^2 .

It is a cyclic number.

It is not a de Polignac number, because 397774795321 - 2²⁵ = 397741240889 is a prime.

It is not a weakly prime, because it can be changed into another prime (397774795421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198887397660 + 198887397661.

It is an arithmetic number, because the mean of its divisors is an integer number (198887397661).

Almost surely, 2^397774795321 is an apocalyptic number.

It is an amenable number.

397774795321 is a deficient number, since it is larger than the sum of its proper divisors (1).

397774795321 is an equidigital number, since it uses as much as digits as its factorization.

397774795321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70013160, while the sum is 64.

The spelling of 397774795321 in words is "three hundred ninety-seven billion, seven hundred seventy-four million, seven hundred ninety-five thousand, three hundred twenty-one".