630815639 has 2 divisors, whose sum is σ = 630815640. Its totient is φ = 630815638.

The previous prime is 630815597. The next prime is 630815671. The reversal of 630815639 is 936518036.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 630815639 - 2²⁰ = 629767063 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 630815596 and 630815605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630815839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315407819 + 315407820.

It is an arithmetic number, because the mean of its divisors is an integer number (315407820).

Almost surely, 2^630815639 is an apocalyptic number.

630815639 is a deficient number, since it is larger than the sum of its proper divisors (1).

630815639 is an equidigital number, since it uses as much as digits as its factorization.

630815639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 630815639 is about 25116.0434583156. The cubic root of 630815639 is about 857.6316843667.

The spelling of 630815639 in words is "six hundred thirty million, eight hundred fifteen thousand, six hundred thirty-nine".