397131451 has 2 divisors, whose sum is σ = 397131452. Its totient is φ = 397131450.

The previous prime is 397131443. The next prime is 397131457. The reversal of 397131451 is 154131793.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397131451 - 2³ = 397131443 is a prime.

It is not a weakly prime, because it can be changed into another prime (397131457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198565725 + 198565726.

It is an arithmetic number, because the mean of its divisors is an integer number (198565726).

Almost surely, 2^397131451 is an apocalyptic number.

397131451 is a deficient number, since it is larger than the sum of its proper divisors (1).

397131451 is an equidigital number, since it uses as much as digits as its factorization.

397131451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 34.

The square root of 397131451 is about 19928.1572404475. The cubic root of 397131451 is about 735.0407684052.

The spelling of 397131451 in words is "three hundred ninety-seven million, one hundred thirty-one thousand, four hundred fifty-one".