397885518791 has 2 divisors, whose sum is σ = 397885518792. Its totient is φ = 397885518790.

The previous prime is 397885518739. The next prime is 397885518869. The reversal of 397885518791 is 197815588793.

It is a weak prime.

It is an emirp because it is prime and its reverse (197815588793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397885518791 - 2¹⁴ = 397885502407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397885578791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198942759395 + 198942759396.

It is an arithmetic number, because the mean of its divisors is an integer number (198942759396).

Almost surely, 2^397885518791 is an apocalyptic number.

397885518791 is a deficient number, since it is larger than the sum of its proper divisors (1).

397885518791 is an equidigital number, since it uses as much as digits as its factorization.

397885518791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 152409600, while the sum is 71.

The spelling of 397885518791 in words is "three hundred ninety-seven billion, eight hundred eighty-five million, five hundred eighteen thousand, seven hundred ninety-one".