2251520154 has 144 divisors (see below), whose sum is σ = 5769566712. Its totient is φ = 628604928.

The previous prime is 2251520149. The next prime is 2251520191. The reversal of 2251520154 is 4510251522.

It can be written as a sum of positive squares in 12 ways, for example, as 173527929 + 2077992225 = 13173^2 + 45585^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3345162 + ... + 3345834.

Almost surely, 2^2251520154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2251520154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2884783356).

2251520154 is an abundant number, since it is smaller than the sum of its proper divisors (3518046558).

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

2251520154 is a wasteful number, since it uses less digits than its factorization.

2251520154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 2251520154 is about 47450.1860270326. The cubic root of 2251520154 is about 1310.6657366331.

Adding to 2251520154 its reverse (4510251522), we get a palindrome (6761771676).

The spelling of 2251520154 in words is "two billion, two hundred fifty-one million, five hundred twenty thousand, one hundred fifty-four".