2251438891 has 16 divisors (see below), whose sum is σ = 2513968128. Its totient is φ = 2002269600.

The previous prime is 2251438883. The next prime is 2251438901. The reversal of 2251438891 is 1988341522.

It is a cyclic number.

It is not a de Polignac number, because 2251438891 - 2³ = 2251438883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2251438291) 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, 79176 + ... + 103786.

It is an arithmetic number, because the mean of its divisors is an integer number (157123008).

Almost surely, 2^2251438891 is an apocalyptic number.

2251438891 is a deficient number, since it is larger than the sum of its proper divisors (262529237).

2251438891 is a wasteful number, since it uses less digits than its factorization.

2251438891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24882.

The product of its digits is 138240, while the sum is 43.

The square root of 2251438891 is about 47449.3297212932. The cubic root of 2251438891 is about 1310.6499680407.

The spelling of 2251438891 in words is "two billion, two hundred fifty-one million, four hundred thirty-eight thousand, eight hundred ninety-one".