636031397 has 8 divisors (see below), whose sum is σ = 664272576. Its totient is φ = 607839232.

The previous prime is 636031391. The next prime is 636031411. The reversal of 636031397 is 793130636.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 636031397 - 2⁴ = 636031381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 636031397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636031391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15653 + ... + 38949.

It is an arithmetic number, because the mean of its divisors is an integer number (83034072).

Almost surely, 2^636031397 is an apocalyptic number.

It is an amenable number.

636031397 is a deficient number, since it is larger than the sum of its proper divisors (28241179).

636031397 is a wasteful number, since it uses less digits than its factorization.

636031397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24507.

The product of its (nonzero) digits is 61236, while the sum is 38.

The square root of 636031397 is about 25219.6629041706. The cubic root of 636031397 is about 859.9889114309.

The spelling of 636031397 in words is "six hundred thirty-six million, thirty-one thousand, three hundred ninety-seven".