630455251 has 4 divisors (see below), whose sum is σ = 667540872. Its totient is φ = 593369632.

The previous prime is 630455249. The next prime is 630455257. The reversal of 630455251 is 152554036.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 630455251 - 2¹ = 630455249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630455257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18542785 + ... + 18542818.

It is an arithmetic number, because the mean of its divisors is an integer number (166885218).

Almost surely, 2^630455251 is an apocalyptic number.

630455251 is a deficient number, since it is larger than the sum of its proper divisors (37085621).

630455251 is a wasteful number, since it uses less digits than its factorization.

630455251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37085620.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 630455251 is about 25108.8679752792. The cubic root of 630455251 is about 857.4683302229.

The spelling of 630455251 in words is "six hundred thirty million, four hundred fifty-five thousand, two hundred fifty-one".