2581201844 has 24 divisors (see below), whose sum is σ = 4996051368. Its totient is φ = 1159125120.

The previous prime is 2581201823. The next prime is 2581201849. The reversal of 2581201844 is 4481021852.

It can be written as a sum of positive squares in 4 ways, for example, as 87198244 + 2494003600 = 9338^2 + 49940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581201849) 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, 668867 + ... + 672714.

It is an arithmetic number, because the mean of its divisors is an integer number (208168807).

Almost surely, 2^2581201844 is an apocalyptic number.

It is an amenable number.

2581201844 is a deficient number, since it is larger than the sum of its proper divisors (2414849524).

2581201844 is a wasteful number, since it uses less digits than its factorization.

2581201844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341635 (or 1341633 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 2581201844 is about 50805.5296596739. The cubic root of 2581201844 is about 1371.7469046976.

The spelling of 2581201844 in words is "two billion, five hundred eighty-one million, two hundred one thousand, eight hundred forty-four".