2116991305 has 32 divisors (see below), whose sum is σ = 3141613440. Its totient is φ = 1346388480.

The previous prime is 2116991299. The next prime is 2116991339. The reversal of 2116991305 is 5031996112.

It is a happy number.

It is not a de Polignac number, because 2116991305 - 2²¹ = 2114894153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64332 + ... + 91501.

It is an arithmetic number, because the mean of its divisors is an integer number (98175420).

Almost surely, 2^2116991305 is an apocalyptic number.

It is an amenable number.

2116991305 is a deficient number, since it is larger than the sum of its proper divisors (1024622135).

2116991305 is a wasteful number, since it uses less digits than its factorization.

2116991305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155881.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 2116991305 is about 46010.7737926673. The cubic root of 2116991305 is about 1284.0236553986.

The spelling of 2116991305 in words is "two billion, one hundred sixteen million, nine hundred ninety-one thousand, three hundred five".