397388527831 has 2 divisors, whose sum is σ = 397388527832. Its totient is φ = 397388527830.

The previous prime is 397388527829. The next prime is 397388527931. The reversal of 397388527831 is 138725883793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397388527831 - 2¹ = 397388527829 is a prime.

It is a super-2 number, since 2×397388527831² (a number of 24 digits) contains 22 as substring.

Together with 397388527829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397388527031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198694263915 + 198694263916.

It is an arithmetic number, because the mean of its divisors is an integer number (198694263916).

Almost surely, 2^397388527831 is an apocalyptic number.

397388527831 is a deficient number, since it is larger than the sum of its proper divisors (1).

397388527831 is an equidigital number, since it uses as much as digits as its factorization.

397388527831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 64.

The spelling of 397388527831 in words is "three hundred ninety-seven billion, three hundred eighty-eight million, five hundred twenty-seven thousand, eight hundred thirty-one".