631913351 has 4 divisors (see below), whose sum is σ = 632021304. Its totient is φ = 631805400.

The previous prime is 631913323. The next prime is 631913353. The reversal of 631913351 is 153319136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 631913351 - 2⁶ = 631913287 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 (631913353) 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, 44660 + ... + 57081.

It is an arithmetic number, because the mean of its divisors is an integer number (158005326).

Almost surely, 2^631913351 is an apocalyptic number.

631913351 is a deficient number, since it is larger than the sum of its proper divisors (107953).

631913351 is a wasteful number, since it uses less digits than its factorization.

631913351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107952.

The product of its digits is 7290, while the sum is 32.

The square root of 631913351 is about 25137.8867648018. The cubic root of 631913351 is about 858.1288645165.

The spelling of 631913351 in words is "six hundred thirty-one million, nine hundred thirteen thousand, three hundred fifty-one".