630651851 has 4 divisors (see below), whose sum is σ = 631947312. Its totient is φ = 629356392.

The previous prime is 630651841. The next prime is 630651863. The reversal of 630651851 is 158156036.

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 630651851 - 2⁶ = 630651787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630651811) 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, 647000 + ... + 647973.

It is an arithmetic number, because the mean of its divisors is an integer number (157986828).

Almost surely, 2^630651851 is an apocalyptic number.

630651851 is a deficient number, since it is larger than the sum of its proper divisors (1295461).

630651851 is a wasteful number, since it uses less digits than its factorization.

630651851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295460.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 630651851 is about 25112.7826216053. The cubic root of 630651851 is about 857.5574514061.

The spelling of 630651851 in words is "six hundred thirty million, six hundred fifty-one thousand, eight hundred fifty-one".