2251891549 has 4 divisors (see below), whose sum is σ = 2252083680. Its totient is φ = 2251699420.

The previous prime is 2251891541. The next prime is 2251891561. The reversal of 2251891549 is 9451981522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2251891549 - 2³ = 2251891541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2251891499 and 2251891508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251891541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77257 + ... + 102334.

It is an arithmetic number, because the mean of its divisors is an integer number (563020920).

Almost surely, 2^2251891549 is an apocalyptic number.

It is an amenable number.

2251891549 is a deficient number, since it is larger than the sum of its proper divisors (192131).

2251891549 is a wasteful number, since it uses less digits than its factorization.

2251891549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192130.

The product of its digits is 259200, while the sum is 46.

The square root of 2251891549 is about 47454.0993908851. The cubic root of 2251891549 is about 1310.7377987520.

The spelling of 2251891549 in words is "two billion, two hundred fifty-one million, eight hundred ninety-one thousand, five hundred forty-nine".