2251009638 has 24 divisors (see below), whose sum is σ = 5045367600. Its totient is φ = 724462704.

The previous prime is 2251009613. The next prime is 2251009643. The reversal of 2251009638 is 8369001522.

2251009638 is a `hidden beast` number, since 2 + 2 + 5 + 10 + 0 + 9 + 638 = 666.

2251009638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2155618 + ... + 2156661.

It is an arithmetic number, because the mean of its divisors is an integer number (210223650).

Almost surely, 2^2251009638 is an apocalyptic number.

2251009638 is an abundant number, since it is smaller than the sum of its proper divisors (2794357962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2251009638 is a wasteful number, since it uses less digits than its factorization.

2251009638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4312316 (or 4312313 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 2251009638 is about 47444.8062278686. The cubic root of 2251009638 is about 1310.5666678022.

The spelling of 2251009638 in words is "two billion, two hundred fifty-one million, nine thousand, six hundred thirty-eight".