630690891 has 16 divisors (see below), whose sum is σ = 854131200. Its totient is φ = 413887968.

The previous prime is 630690881. The next prime is 630690917. The reversal of 630690891 is 198096036.

630690891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 630690891 - 2¹¹ = 630688843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (630690821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78405 + ... + 86073.

It is an arithmetic number, because the mean of its divisors is an integer number (53383200).

Almost surely, 2^630690891 is an apocalyptic number.

630690891 is a deficient number, since it is larger than the sum of its proper divisors (223440309).

630690891 is a wasteful number, since it uses less digits than its factorization.

630690891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8098.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 630690891 is about 25113.5599029688. The cubic root of 630690891 is about 857.5751465110.

The spelling of 630690891 in words is "six hundred thirty million, six hundred ninety thousand, eight hundred ninety-one".