630340681 has 2 divisors, whose sum is σ = 630340682. Its totient is φ = 630340680.

The previous prime is 630340679. The next prime is 630340687. The reversal of 630340681 is 186043036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 453690000 + 176650681 = 21300^2 + 13291^2 .

It is a cyclic number.

It is not a de Polignac number, because 630340681 - 2¹ = 630340679 is a prime.

It is a super-2 number, since 2×630340681² = 794658748247087522, which contains 22 as substring.

Together with 630340679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (630340687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315170340 + 315170341.

It is an arithmetic number, because the mean of its divisors is an integer number (315170341).

Almost surely, 2^630340681 is an apocalyptic number.

It is an amenable number.

630340681 is a deficient number, since it is larger than the sum of its proper divisors (1).

630340681 is an equidigital number, since it uses as much as digits as its factorization.

630340681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 630340681 is about 25106.5864067579. The cubic root of 630340681 is about 857.4163856966.

The spelling of 630340681 in words is "six hundred thirty million, three hundred forty thousand, six hundred eighty-one".