631380479 has 4 divisors (see below), whose sum is σ = 633029376. Its totient is φ = 629731584.

The previous prime is 631380473. The next prime is 631380509. The reversal of 631380479 is 974083136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631380479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631380473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823874 + ... + 824639.

It is an arithmetic number, because the mean of its divisors is an integer number (158257344).

Almost surely, 2^631380479 is an apocalyptic number.

631380479 is a deficient number, since it is larger than the sum of its proper divisors (1648897).

631380479 is a wasteful number, since it uses less digits than its factorization.

631380479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648896.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 631380479 is about 25127.2855477865. The cubic root of 631380479 is about 857.8875859519.

The spelling of 631380479 in words is "six hundred thirty-one million, three hundred eighty thousand, four hundred seventy-nine".