2813550721 has 4 divisors (see below), whose sum is σ = 2813764932. Its totient is φ = 2813336512.

The previous prime is 2813550709. The next prime is 2813550829. The reversal of 2813550721 is 1270553182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 600789121 + 2212761600 = 24511^2 + 47040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2813550721 - 2⁵ = 2813550689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2813550121) 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, 86020 + ... + 114133.

It is an arithmetic number, because the mean of its divisors is an integer number (703441233).

Almost surely, 2^2813550721 is an apocalyptic number.

It is an amenable number.

2813550721 is a deficient number, since it is larger than the sum of its proper divisors (214211).

2813550721 is a wasteful number, since it uses less digits than its factorization.

2813550721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214210.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 2813550721 is about 53042.9139565315. The cubic root of 2813550721 is about 1411.7298021148.

The spelling of 2813550721 in words is "two billion, eight hundred thirteen million, five hundred fifty thousand, seven hundred twenty-one".