630637121 has 2 divisors, whose sum is σ = 630637122. Its totient is φ = 630637120.

The previous prime is 630637081. The next prime is 630637141. The reversal of 630637121 is 121736036.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388523521 + 242113600 = 19711^2 + 15560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630637121 is a prime.

It is not a weakly prime, because it can be changed into another prime (630637141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315318560 + 315318561.

It is an arithmetic number, because the mean of its divisors is an integer number (315318561).

Almost surely, 2^630637121 is an apocalyptic number.

It is an amenable number.

630637121 is a deficient number, since it is larger than the sum of its proper divisors (1).

630637121 is an equidigital number, since it uses as much as digits as its factorization.

630637121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 630637121 is about 25112.4893429544. The cubic root of 630637121 is about 857.5507747589.

The spelling of 630637121 in words is "six hundred thirty million, six hundred thirty-seven thousand, one hundred twenty-one".