315939397 has 2 divisors, whose sum is σ = 315939398. Its totient is φ = 315939396.

The previous prime is 315939367. The next prime is 315939433. The reversal of 315939397 is 793939513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305865121 + 10074276 = 17489^2 + 3174^2 .

It is an emirp because it is prime and its reverse (793939513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315939397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315939397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315939367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157969698 + 157969699.

It is an arithmetic number, because the mean of its divisors is an integer number (157969699).

Almost surely, 2^315939397 is an apocalyptic number.

It is an amenable number.

315939397 is a deficient number, since it is larger than the sum of its proper divisors (1).

315939397 is an equidigital number, since it uses as much as digits as its factorization.

315939397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 688905, while the sum is 49.

The square root of 315939397 is about 17774.6841603445. The cubic root of 315939397 is about 681.0849153394.

The spelling of 315939397 in words is "three hundred fifteen million, nine hundred thirty-nine thousand, three hundred ninety-seven".