397381331 has 2 divisors, whose sum is σ = 397381332. Its totient is φ = 397381330.

The previous prime is 397381321. The next prime is 397381339. The reversal of 397381331 is 133183793.

It is a strong prime.

It is an emirp because it is prime and its reverse (133183793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397381331 is a prime.

It is a super-2 number, since 2×397381331² = 315823844454663122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (397381339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198690665 + 198690666.

It is an arithmetic number, because the mean of its divisors is an integer number (198690666).

Almost surely, 2^397381331 is an apocalyptic number.

397381331 is a deficient number, since it is larger than the sum of its proper divisors (1).

397381331 is an equidigital number, since it uses as much as digits as its factorization.

397381331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 397381331 is about 19934.4257755271. The cubic root of 397381331 is about 735.1949016503.

The spelling of 397381331 in words is "three hundred ninety-seven million, three hundred eighty-one thousand, three hundred thirty-one".