2111975813 has 2 divisors, whose sum is σ = 2111975814. Its totient is φ = 2111975812.

The previous prime is 2111975791. The next prime is 2111975821. The reversal of 2111975813 is 3185791112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1609453924 + 502521889 = 40118^2 + 22417^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111975813 - 2¹⁶ = 2111910277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111975893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055987906 + 1055987907.

It is an arithmetic number, because the mean of its divisors is an integer number (1055987907).

Almost surely, 2^2111975813 is an apocalyptic number.

It is an amenable number.

2111975813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111975813 is an equidigital number, since it uses as much as digits as its factorization.

2111975813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 2111975813 is about 45956.2380205343. The cubic root of 2111975813 is about 1283.0088342124.

The spelling of 2111975813 in words is "two billion, one hundred eleven million, nine hundred seventy-five thousand, eight hundred thirteen".