6397631 has 2 divisors, whose sum is σ = 6397632. Its totient is φ = 6397630.

The previous prime is 6397609. The next prime is 6397649. The reversal of 6397631 is 1367936.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6397631 is a prime.

It is a super-2 number, since 2×6397631² = 81859364824322, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6397591 and 6397600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6397691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3198815 + 3198816.

It is an arithmetic number, because the mean of its divisors is an integer number (3198816).

Almost surely, 2^6397631 is an apocalyptic number.

6397631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6397631 is an equidigital number, since it uses as much as digits as its factorization.

6397631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 35.

The square root of 6397631 is about 2529.3538700625. The cubic root of 6397631 is about 185.6406423425.

The spelling of 6397631 in words is "six million, three hundred ninety-seven thousand, six hundred thirty-one".