2116307491 has 4 divisors (see below), whose sum is σ = 2138125192. Its totient is φ = 2094489792.

The previous prime is 2116307483. The next prime is 2116307527. The reversal of 2116307491 is 1947036112.

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 2116307491 - 2³ = 2116307483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116307461) 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, 10908705 + ... + 10908898.

It is an arithmetic number, because the mean of its divisors is an integer number (534531298).

Almost surely, 2^2116307491 is an apocalyptic number.

2116307491 is a deficient number, since it is larger than the sum of its proper divisors (21817701).

2116307491 is an equidigital number, since it uses as much as digits as its factorization.

2116307491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21817700.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 2116307491 is about 46003.3421720640. The cubic root of 2116307491 is about 1283.8853887455.

The spelling of 2116307491 in words is "two billion, one hundred sixteen million, three hundred seven thousand, four hundred ninety-one".