2521981799 has 4 divisors (see below), whose sum is σ = 2544300336. Its totient is φ = 2499663264.

The previous prime is 2521981783. The next prime is 2521981811. The reversal of 2521981799 is 9971891252.

It is a happy number.

2521981799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2521981799 - 2⁴ = 2521981783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2521981799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521981769) 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, 11159099 + ... + 11159324.

It is an arithmetic number, because the mean of its divisors is an integer number (636075084).

Almost surely, 2^2521981799 is an apocalyptic number.

2521981799 is a deficient number, since it is larger than the sum of its proper divisors (22318537).

2521981799 is a wasteful number, since it uses less digits than its factorization.

2521981799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22318536.

The product of its digits is 816480, while the sum is 53.

The square root of 2521981799 is about 50219.3369032288. The cubic root of 2521981799 is about 1361.1750583672.

The spelling of 2521981799 in words is "two billion, five hundred twenty-one million, nine hundred eighty-one thousand, seven hundred ninety-nine".