2117912087 has 2 divisors, whose sum is σ = 2117912088. Its totient is φ = 2117912086.

The previous prime is 2117912077. The next prime is 2117912129. The reversal of 2117912087 is 7802197112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2117912087 - 2⁶ = 2117912023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2117912087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117912057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058956043 + 1058956044.

It is an arithmetic number, because the mean of its divisors is an integer number (1058956044).

Almost surely, 2^2117912087 is an apocalyptic number.

2117912087 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117912087 is an equidigital number, since it uses as much as digits as its factorization.

2117912087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 38.

The square root of 2117912087 is about 46020.7788612926. The cubic root of 2117912087 is about 1284.2097897636.

The spelling of 2117912087 in words is "two billion, one hundred seventeen million, nine hundred twelve thousand, eighty-seven".