630343881 has 18 divisors (see below), whose sum is σ = 933418122. Its totient is φ = 409666080.

The previous prime is 630343871. The next prime is 630343897. The reversal of 630343881 is 188343036.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 384356025 + 245987856 = 19605^2 + 15684^2 .

It is not a de Polignac number, because 630343881 - 2¹⁰ = 630342857 is a prime.

It is a super-2 number, since 2×630343881² = 794666816628284322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630343811) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 481630 + ... + 482936.

Almost surely, 2^630343881 is an apocalyptic number.

It is an amenable number.

630343881 is a deficient number, since it is larger than the sum of its proper divisors (303074241).

630343881 is an equidigital number, since it uses as much as digits as its factorization.

630343881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 630343881 is about 25106.6501349742. The cubic root of 630343881 is about 857.4178366198.

The spelling of 630343881 in words is "six hundred thirty million, three hundred forty-three thousand, eight hundred eighty-one".