2251649216 has 56 divisors (see below), whose sum is σ = 4707965184. Its totient is φ = 1066348800.

The previous prime is 2251649209. The next prime is 2251649219. The reversal of 2251649216 is 6129461522.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2251649216.

It is not an unprimeable number, because it can be changed into a prime (2251649219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144191 + ... + 159041.

Almost surely, 2^2251649216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2251649216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2353982592).

2251649216 is an abundant number, since it is smaller than the sum of its proper divisors (2456315968).

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

2251649216 is a wasteful number, since it uses less digits than its factorization.

2251649216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14989 (or 14979 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 2251649216 is about 47451.5459811374. The cubic root of 2251649216 is about 1310.6907795519.

The spelling of 2251649216 in words is "two billion, two hundred fifty-one million, six hundred forty-nine thousand, two hundred sixteen".