397545791 has 2 divisors, whose sum is σ = 397545792. Its totient is φ = 397545790.

The previous prime is 397545779. The next prime is 397545817. The reversal of 397545791 is 197545793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397545791 - 2⁶ = 397545727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397545761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198772895 + 198772896.

It is an arithmetic number, because the mean of its divisors is an integer number (198772896).

Almost surely, 2^397545791 is an apocalyptic number.

397545791 is a deficient number, since it is larger than the sum of its proper divisors (1).

397545791 is an equidigital number, since it uses as much as digits as its factorization.

397545791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1190700, while the sum is 50.

The square root of 397545791 is about 19938.5503735853. The cubic root of 397545791 is about 735.2963101027.

The spelling of 397545791 in words is "three hundred ninety-seven million, five hundred forty-five thousand, seven hundred ninety-one".