631660867 has 8 divisors (see below), whose sum is σ = 652354560. Its totient is φ = 610987080.

The previous prime is 631660849. The next prime is 631660873. The reversal of 631660867 is 768066136.

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

It is a cyclic number.

It is not a de Polignac number, because 631660867 - 2⁷ = 631660739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631660807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86484 + ... + 93502.

It is an arithmetic number, because the mean of its divisors is an integer number (81544320).

Almost surely, 2^631660867 is an apocalyptic number.

631660867 is a deficient number, since it is larger than the sum of its proper divisors (20693693).

631660867 is a wasteful number, since it uses less digits than its factorization.

631660867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9953.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 631660867 is about 25132.8642816532. The cubic root of 631660867 is about 858.0145594616.

The spelling of 631660867 in words is "six hundred thirty-one million, six hundred sixty thousand, eight hundred sixty-seven".