631866745 has 4 divisors (see below), whose sum is σ = 758240100. Its totient is φ = 505493392.

The previous prime is 631866713. The next prime is 631866751. The reversal of 631866745 is 547668136.

631866745 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 133148521 + 498718224 = 11539^2 + 22332^2 .

It is a cyclic number.

It is not a de Polignac number, because 631866745 - 2⁵ = 631866713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631866695 and 631866704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63186670 + ... + 63186679.

It is an arithmetic number, because the mean of its divisors is an integer number (189560025).

Almost surely, 2^631866745 is an apocalyptic number.

It is an amenable number.

631866745 is a deficient number, since it is larger than the sum of its proper divisors (126373355).

631866745 is a wasteful number, since it uses less digits than its factorization.

631866745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126373354.

The product of its digits is 725760, while the sum is 46.

The square root of 631866745 is about 25136.9597405892. The cubic root of 631866745 is about 858.1077672479.

The spelling of 631866745 in words is "six hundred thirty-one million, eight hundred sixty-six thousand, seven hundred forty-five".