630221631 has 64 divisors (see below), whose sum is σ = 965099520. Its totient is φ = 363242880.

The previous prime is 630221609. The next prime is 630221639. The reversal of 630221631 is 136122036.

It is a happy number.

It is not a de Polignac number, because 630221631 - 2⁶ = 630221567 is a prime.

It is a super-2 number, since 2×630221631² = 794358608360600322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630221639) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7977450 + ... + 7977528.

It is an arithmetic number, because the mean of its divisors is an integer number (15079680).

Almost surely, 2^630221631 is an apocalyptic number.

630221631 is a deficient number, since it is larger than the sum of its proper divisors (334877889).

630221631 is a wasteful number, since it uses less digits than its factorization.

630221631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 630221631 is about 25104.2154029956. The cubic root of 630221631 is about 857.3624033287.

Adding to 630221631 its reverse (136122036), we get a palindrome (766343667).

The spelling of 630221631 in words is "six hundred thirty million, two hundred twenty-one thousand, six hundred thirty-one".