631998947 has 8 divisors (see below), whose sum is σ = 640688736. Its totient is φ = 623368512.

The previous prime is 631998937. The next prime is 631998959. The reversal of 631998947 is 749899136.

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 631998947 - 2⁴ = 631998931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631998892 and 631998901.

It is not an unprimeable number, because it can be changed into a prime (631998937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6818 + ... + 36200.

It is an arithmetic number, because the mean of its divisors is an integer number (80086092).

Almost surely, 2^631998947 is an apocalyptic number.

631998947 is a deficient number, since it is larger than the sum of its proper divisors (8689789).

631998947 is a wasteful number, since it uses less digits than its factorization.

631998947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29677.

The product of its digits is 2939328, while the sum is 56.

The square root of 631998947 is about 25139.5892368988. The cubic root of 631998947 is about 858.1676087958.

The spelling of 631998947 in words is "six hundred thirty-one million, nine hundred ninety-eight thousand, nine hundred forty-seven".