631394385 has 8 divisors (see below), whose sum is σ = 1010231040. Its totient is φ = 336743664.

The previous prime is 631394369. The next prime is 631394389. The reversal of 631394385 is 583493136.

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

It is not a de Polignac number, because 631394385 - 2⁴ = 631394369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631394389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21046465 + ... + 21046494.

It is an arithmetic number, because the mean of its divisors is an integer number (126278880).

Almost surely, 2^631394385 is an apocalyptic number.

It is an amenable number.

631394385 is a deficient number, since it is larger than the sum of its proper divisors (378836655).

631394385 is a wasteful number, since it uses less digits than its factorization.

631394385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42092967.

The product of its digits is 233280, while the sum is 42.

The square root of 631394385 is about 25127.5622574097. The cubic root of 631394385 is about 857.8938841601.

The spelling of 631394385 in words is "six hundred thirty-one million, three hundred ninety-four thousand, three hundred eighty-five".