631205745 has 16 divisors (see below), whose sum is σ = 1063083840. Its totient is φ = 318924864.

The previous prime is 631205719. The next prime is 631205759. The reversal of 631205745 is 547502136.

It is not a de Polignac number, because 631205745 - 2⁵ = 631205713 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1107094 + ... + 1107663.

It is an arithmetic number, because the mean of its divisors is an integer number (66442740).

Almost surely, 2^631205745 is an apocalyptic number.

It is an amenable number.

631205745 is a deficient number, since it is larger than the sum of its proper divisors (431878095).

631205745 is a wasteful number, since it uses less digits than its factorization.

631205745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214784.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 631205745 is about 25123.8083299487. The cubic root of 631205745 is about 857.8084387683.

The spelling of 631205745 in words is "six hundred thirty-one million, two hundred five thousand, seven hundred forty-five".