2516516891 has 4 divisors (see below), whose sum is σ = 2876019312. Its totient is φ = 2157014472.

The previous prime is 2516516887. The next prime is 2516516929. The reversal of 2516516891 is 1986156152.

2516516891 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 2516516891 - 2² = 2516516887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2516516831) 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, 179751200 + ... + 179751213.

It is an arithmetic number, because the mean of its divisors is an integer number (719004828).

Almost surely, 2^2516516891 is an apocalyptic number.

2516516891 is a deficient number, since it is larger than the sum of its proper divisors (359502421).

2516516891 is an equidigital number, since it uses as much as digits as its factorization.

2516516891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359502420.

The product of its digits is 129600, while the sum is 44.

The square root of 2516516891 is about 50164.8969997946. The cubic root of 2516516891 is about 1360.1911659984.

The spelling of 2516516891 in words is "two billion, five hundred sixteen million, five hundred sixteen thousand, eight hundred ninety-one".