2119116581 has 2 divisors, whose sum is σ = 2119116582. Its totient is φ = 2119116580.

The previous prime is 2119116553. The next prime is 2119116599. The reversal of 2119116581 is 1856119112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213407556 + 905709025 = 34834^2 + 30095^2 .

It is a cyclic number.

It is not a de Polignac number, because 2119116581 - 2²⁶ = 2052007717 is a prime.

It is a super-3 number, since 3×2119116581³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2119118581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059558290 + 1059558291.

It is an arithmetic number, because the mean of its divisors is an integer number (1059558291).

Almost surely, 2^2119116581 is an apocalyptic number.

It is an amenable number.

2119116581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2119116581 is an equidigital number, since it uses as much as digits as its factorization.

2119116581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 35.

The square root of 2119116581 is about 46033.8634159680. The cubic root of 2119116581 is about 1284.4531945542.

The spelling of 2119116581 in words is "two billion, one hundred nineteen million, one hundred sixteen thousand, five hundred eighty-one".