6631397 has 4 divisors (see below), whose sum is σ = 6638016. Its totient is φ = 6624780.

The previous prime is 6631379. The next prime is 6631409. The reversal of 6631397 is 7931366.

6631397 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6631397 - 2⁶ = 6631333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6631327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1463 + ... + 3924.

It is an arithmetic number, because the mean of its divisors is an integer number (1659504).

Almost surely, 2^6631397 is an apocalyptic number.

It is an amenable number.

6631397 is a deficient number, since it is larger than the sum of its proper divisors (6619).

6631397 is a wasteful number, since it uses less digits than its factorization.

6631397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6618.

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

The square root of 6631397 is about 2575.1498985496. The cubic root of 6631397 is about 187.8747184786.

The spelling of 6631397 in words is "six million, six hundred thirty-one thousand, three hundred ninety-seven".