2151840256 has 80 divisors (see below), whose sum is σ = 4507747200. Its totient is φ = 1024258048.

The previous prime is 2151840253. The next prime is 2151840277. The reversal of 2151840256 is 6520481512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151840253) 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, 4227330 + ... + 4227838.

It is an arithmetic number, because the mean of its divisors is an integer number (56346840).

Almost surely, 2^2151840256 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 2151840256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2253873600).

2151840256 is an abundant number, since it is smaller than the sum of its proper divisors (2355906944).

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

2151840256 is an equidigital number, since it uses as much as digits as its factorization.

2151840256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 2151840256 is about 46387.9322238015. The cubic root of 2151840256 is about 1291.0310159881.

The spelling of 2151840256 in words is "two billion, one hundred fifty-one million, eight hundred forty thousand, two hundred fifty-six".