631121393 has 8 divisors (see below), whose sum is σ = 722124288. Its totient is φ = 540329184.

The previous prime is 631121389. The next prime is 631121411. The reversal of 631121393 is 393121136.

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 631121393 - 2² = 631121389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631121303) 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, 46196 + ... + 58277.

It is an arithmetic number, because the mean of its divisors is an integer number (90265536).

Almost surely, 2^631121393 is an apocalyptic number.

It is an amenable number.

631121393 is a deficient number, since it is larger than the sum of its proper divisors (91002895).

631121393 is a wasteful number, since it uses less digits than its factorization.

631121393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105343.

The product of its digits is 2916, while the sum is 29.

The square root of 631121393 is about 25122.1295474727. The cubic root of 631121393 is about 857.7702256175.

The spelling of 631121393 in words is "six hundred thirty-one million, one hundred twenty-one thousand, three hundred ninety-three".