397130891 has 2 divisors, whose sum is σ = 397130892. Its totient is φ = 397130890.

The previous prime is 397130869. The next prime is 397130911. The reversal of 397130891 is 198031793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397130891 - 2⁶ = 397130827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397130861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198565445 + 198565446.

It is an arithmetic number, because the mean of its divisors is an integer number (198565446).

Almost surely, 2^397130891 is an apocalyptic number.

397130891 is a deficient number, since it is larger than the sum of its proper divisors (1).

397130891 is an equidigital number, since it uses as much as digits as its factorization.

397130891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 397130891 is about 19928.1431899713. The cubic root of 397130891 is about 735.0404229083.

The spelling of 397130891 in words is "three hundred ninety-seven million, one hundred thirty thousand, eight hundred ninety-one".