630105251 has 2 divisors, whose sum is σ = 630105252. Its totient is φ = 630105250.

The previous prime is 630105211. The next prime is 630105253. The reversal of 630105251 is 152501036.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630105251 is a prime.

Together with 630105253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (630105253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315052625 + 315052626.

It is an arithmetic number, because the mean of its divisors is an integer number (315052626).

Almost surely, 2^630105251 is an apocalyptic number.

630105251 is a deficient number, since it is larger than the sum of its proper divisors (1).

630105251 is an equidigital number, since it uses as much as digits as its factorization.

630105251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 630105251 is about 25101.8973585663. The cubic root of 630105251 is about 857.3096250815.

Adding to 630105251 its reverse (152501036), we get a palindrome (782606287).

The spelling of 630105251 in words is "six hundred thirty million, one hundred five thousand, two hundred fifty-one".