630431999 has 4 divisors (see below), whose sum is σ = 630867336. Its totient is φ = 629996664.

The previous prime is 630431993. The next prime is 630432007. The reversal of 630431999 is 999134036.

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

It is a cyclic number.

It is not a de Polignac number, because 630431999 - 2¹⁶ = 630366463 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 (630431993) 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, 215489 + ... + 218394.

It is an arithmetic number, because the mean of its divisors is an integer number (157716834).

Almost surely, 2^630431999 is an apocalyptic number.

630431999 is a deficient number, since it is larger than the sum of its proper divisors (435337).

630431999 is a wasteful number, since it uses less digits than its factorization.

630431999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435336.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 630431999 is about 25108.4049473478. The cubic root of 630431999 is about 857.4577885819.

The spelling of 630431999 in words is "six hundred thirty million, four hundred thirty-one thousand, nine hundred ninety-nine".