630251551 has 4 divisors (see below), whose sum is σ = 630745600. Its totient is φ = 629757504.

The previous prime is 630251539. The next prime is 630251581. The reversal of 630251551 is 155152036.

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

It is a cyclic number.

It is not a de Polignac number, because 630251551 - 2⁷ = 630251423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630251581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245106 + ... + 247663.

It is an arithmetic number, because the mean of its divisors is an integer number (157686400).

Almost surely, 2^630251551 is an apocalyptic number.

630251551 is a deficient number, since it is larger than the sum of its proper divisors (494049).

630251551 is a wasteful number, since it uses less digits than its factorization.

630251551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494048.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 630251551 is about 25104.8113117785. The cubic root of 630251551 is about 857.3759709775.

The spelling of 630251551 in words is "six hundred thirty million, two hundred fifty-one thousand, five hundred fifty-one".