631305385 has 8 divisors (see below), whose sum is σ = 758332296. Its totient is φ = 504533760.

The previous prime is 631305383. The next prime is 631305407. The reversal of 631305385 is 583503136.

It can be written as a sum of positive squares in 4 ways, for example, as 82246761 + 549058624 = 9069^2 + 23432^2 .

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

It is not a de Polignac number, because 631305385 - 2¹ = 631305383 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 631305385.

It is not an unprimeable number, because it can be changed into a prime (631305383) 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, 58336 + ... + 68305.

It is an arithmetic number, because the mean of its divisors is an integer number (94791537).

Almost surely, 2^631305385 is an apocalyptic number.

It is an amenable number.

631305385 is a deficient number, since it is larger than the sum of its proper divisors (127026911).

631305385 is a wasteful number, since it uses less digits than its factorization.

631305385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127643.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 631305385 is about 25125.7912313224. The cubic root of 631305385 is about 857.8535733046.

The spelling of 631305385 in words is "six hundred thirty-one million, three hundred five thousand, three hundred eighty-five".