2251851889 has 6 divisors (see below), whose sum is σ = 2619501234. Its totient is φ = 1930158720.

The previous prime is 2251851853. The next prime is 2251851913. The reversal of 2251851889 is 9881581522.

It can be written as a sum of positive squares in only one way, i.e., 2034731664 + 217120225 = 45108^2 + 14735^2 .

It is not a de Polignac number, because 2251851889 - 2³¹ = 104368241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 45956161 = 2251851889 / (2 + 2 + 5 + 1 + 8 + 5 + 1 + 8 + 8 + 9).

It is not an unprimeable number, because it can be changed into a prime (2251851829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22978032 + ... + 22978129.

It is an arithmetic number, because the mean of its divisors is an integer number (436583539).

Almost surely, 2^2251851889 is an apocalyptic number.

It is an amenable number.

2251851889 is a deficient number, since it is larger than the sum of its proper divisors (367649345).

2251851889 is an equidigital number, since it uses as much as digits as its factorization.

2251851889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45956175 (or 45956168 counting only the distinct ones).

The product of its digits is 460800, while the sum is 49.

The square root of 2251851889 is about 47453.6815115540. The cubic root of 2251851889 is about 1310.7301038630.

The spelling of 2251851889 in words is "two billion, two hundred fifty-one million, eight hundred fifty-one thousand, eight hundred eighty-nine".