630631637 has 2 divisors, whose sum is σ = 630631638. Its totient is φ = 630631636.

The previous prime is 630631633. The next prime is 630631669. The reversal of 630631637 is 736136036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 415099876 + 215531761 = 20374^2 + 14681^2 .

It is a cyclic number.

It is not a de Polignac number, because 630631637 - 2² = 630631633 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 630631597 and 630631606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630631633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315315818 + 315315819.

It is an arithmetic number, because the mean of its divisors is an integer number (315315819).

Almost surely, 2^630631637 is an apocalyptic number.

It is an amenable number.

630631637 is a deficient number, since it is larger than the sum of its proper divisors (1).

630631637 is an equidigital number, since it uses as much as digits as its factorization.

630631637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 35.

The square root of 630631637 is about 25112.3801540197. The cubic root of 630631637 is about 857.5482890071.

The spelling of 630631637 in words is "six hundred thirty million, six hundred thirty-one thousand, six hundred thirty-seven".