630642431 has 4 divisors (see below), whose sum is σ = 630835200. Its totient is φ = 630449664.

The previous prime is 630642427. The next prime is 630642437. The reversal of 630642431 is 134246036.

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 630642431 - 2² = 630642427 is a prime.

It is a super-2 number, since 2×630642431² = 795419751555179522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 630642394 and 630642403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630642437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91391 + ... + 98048.

It is an arithmetic number, because the mean of its divisors is an integer number (157708800).

Almost surely, 2^630642431 is an apocalyptic number.

630642431 is a deficient number, since it is larger than the sum of its proper divisors (192769).

630642431 is a wasteful number, since it uses less digits than its factorization.

630642431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192768.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 630642431 is about 25112.5950670177. The cubic root of 630642431 is about 857.5531816274.

Adding to 630642431 its reverse (134246036), we get a palindrome (764888467).

The spelling of 630642431 in words is "six hundred thirty million, six hundred forty-two thousand, four hundred thirty-one".