631345399 has 4 divisors (see below), whose sum is σ = 653115960. Its totient is φ = 609574840.

The previous prime is 631345301. The next prime is 631345409. The reversal of 631345399 is 993543136.

631345399 is digitally balanced in base 2, 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.

It is a cyclic number.

It is not a de Polignac number, because 631345399 - 2⁷ = 631345271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631345499) 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, 10885237 + ... + 10885294.

It is an arithmetic number, because the mean of its divisors is an integer number (163278990).

Almost surely, 2^631345399 is an apocalyptic number.

631345399 is a deficient number, since it is larger than the sum of its proper divisors (21770561).

631345399 is a wasteful number, since it uses less digits than its factorization.

631345399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21770560.

The product of its digits is 262440, while the sum is 43.

The square root of 631345399 is about 25126.5874921367. The cubic root of 631345399 is about 857.8716973528.

The spelling of 631345399 in words is "six hundred thirty-one million, three hundred forty-five thousand, three hundred ninety-nine".