319597561397 has 2 divisors, whose sum is σ = 319597561398. Its totient is φ = 319597561396.

The previous prime is 319597561369. The next prime is 319597561411. The reversal of 319597561397 is 793165795913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284927493796 + 34670067601 = 533786^2 + 186199^2 .

It is a cyclic number.

It is not a de Polignac number, because 319597561397 - 2²⁰ = 319596512821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319597561897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159798780698 + 159798780699.

It is an arithmetic number, because the mean of its divisors is an integer number (159798780699).

Almost surely, 2^319597561397 is an apocalyptic number.

It is an amenable number.

319597561397 is a deficient number, since it is larger than the sum of its proper divisors (1).

319597561397 is an equidigital number, since it uses as much as digits as its factorization.

319597561397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48223350, while the sum is 65.

The spelling of 319597561397 in words is "three hundred nineteen billion, five hundred ninety-seven million, five hundred sixty-one thousand, three hundred ninety-seven".