397911313 has 2 divisors, whose sum is σ = 397911314. Its totient is φ = 397911312.

The previous prime is 397911277. The next prime is 397911323. The reversal of 397911313 is 313119793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 369523729 + 28387584 = 19223^2 + 5328^2 .

It is a cyclic number.

It is not a de Polignac number, because 397911313 - 2⁹ = 397910801 is a prime.

It is not a weakly prime, because it can be changed into another prime (397911323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198955656 + 198955657.

It is an arithmetic number, because the mean of its divisors is an integer number (198955657).

Almost surely, 2^397911313 is an apocalyptic number.

It is an amenable number.

397911313 is a deficient number, since it is larger than the sum of its proper divisors (1).

397911313 is an equidigital number, since it uses as much as digits as its factorization.

397911313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 37.

The square root of 397911313 is about 19947.7144806116. The cubic root of 397911313 is about 735.5215962238.

The spelling of 397911313 in words is "three hundred ninety-seven million, nine hundred eleven thousand, three hundred thirteen".