2138687699 has 2 divisors, whose sum is σ = 2138687700. Its totient is φ = 2138687698.

The previous prime is 2138687659. The next prime is 2138687717. The reversal of 2138687699 is 9967868312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2138687699 - 2²⁰ = 2137639123 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138687659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069343849 + 1069343850.

It is an arithmetic number, because the mean of its divisors is an integer number (1069343850).

Almost surely, 2^2138687699 is an apocalyptic number.

2138687699 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138687699 is an equidigital number, since it uses as much as digits as its factorization.

2138687699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The square root of 2138687699 is about 46245.9479197908. The cubic root of 2138687699 is about 1288.3952761946.

The spelling of 2138687699 in words is "two billion, one hundred thirty-eight million, six hundred eighty-seven thousand, six hundred ninety-nine".