2189713081 has 2 divisors, whose sum is σ = 2189713082. Its totient is φ = 2189713080.

The previous prime is 2189713039. The next prime is 2189713093. The reversal of 2189713081 is 1803179812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2089312681 + 100400400 = 45709^2 + 10020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189713081 - 2²⁵ = 2156158649 is a prime.

It is a super-2 number, since 2×2189713081² = 9589686754205025122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2189713181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094856540 + 1094856541.

It is an arithmetic number, because the mean of its divisors is an integer number (1094856541).

Almost surely, 2^2189713081 is an apocalyptic number.

It is an amenable number.

2189713081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189713081 is an equidigital number, since it uses as much as digits as its factorization.

2189713081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 2189713081 is about 46794.3701848844. The cubic root of 2189713081 is about 1298.5611459181.

The spelling of 2189713081 in words is "two billion, one hundred eighty-nine million, seven hundred thirteen thousand, eighty-one".