630921563 has 2 divisors, whose sum is σ = 630921564. Its totient is φ = 630921562.

The previous prime is 630921547. The next prime is 630921587. The reversal of 630921563 is 365129036.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 630921563 - 2⁴ = 630921547 is a prime.

It is equal to p_32852681 and since 630921563 and 32852681 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (630921523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315460781 + 315460782.

It is an arithmetic number, because the mean of its divisors is an integer number (315460782).

Almost surely, 2^630921563 is an apocalyptic number.

630921563 is a deficient number, since it is larger than the sum of its proper divisors (1).

630921563 is an equidigital number, since it uses as much as digits as its factorization.

630921563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 630921563 is about 25118.1520618058. The cubic root of 630921563 is about 857.6796850231.

It can be divided in two parts, 6309 and 21563, that added together give a palindrome (27872).

The spelling of 630921563 in words is "six hundred thirty million, nine hundred twenty-one thousand, five hundred sixty-three".