630621949 has 2 divisors, whose sum is σ = 630621950. Its totient is φ = 630621948.

The previous prime is 630621883. The next prime is 630621977. The reversal of 630621949 is 949126036.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495062500 + 135559449 = 22250^2 + 11643^2 .

It is a cyclic number.

It is not a de Polignac number, because 630621949 - 2¹⁵ = 630589181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630621049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315310974 + 315310975.

It is an arithmetic number, because the mean of its divisors is an integer number (315310975).

Almost surely, 2^630621949 is an apocalyptic number.

It is an amenable number.

630621949 is a deficient number, since it is larger than the sum of its proper divisors (1).

630621949 is an equidigital number, since it uses as much as digits as its factorization.

630621949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 630621949 is about 25112.1872603722. The cubic root of 630621949 is about 857.5438976584.

The spelling of 630621949 in words is "six hundred thirty million, six hundred twenty-one thousand, nine hundred forty-nine".