631370345 has 4 divisors (see below), whose sum is σ = 757644420. Its totient is φ = 505096272.

The previous prime is 631370329. The next prime is 631370347. The reversal of 631370345 is 543073136.

631370345 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 can be written as a sum of positive squares in 2 ways, for example, as 153685609 + 477684736 = 12397^2 + 21856^2 .

It is a cyclic number.

It is not a de Polignac number, because 631370345 - 2⁴ = 631370329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631370347) 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, 63137030 + ... + 63137039.

It is an arithmetic number, because the mean of its divisors is an integer number (189411105).

Almost surely, 2^631370345 is an apocalyptic number.

It is an amenable number.

631370345 is a deficient number, since it is larger than the sum of its proper divisors (126274075).

631370345 is a wasteful number, since it uses less digits than its factorization.

631370345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126274074.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 631370345 is about 25127.0838936793. The cubic root of 631370345 is about 857.8829960732.

The spelling of 631370345 in words is "six hundred thirty-one million, three hundred seventy thousand, three hundred forty-five".