2139247499 has 2 divisors, whose sum is σ = 2139247500. Its totient is φ = 2139247498.

The previous prime is 2139247477. The next prime is 2139247511. The reversal of 2139247499 is 9947429312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2139247499 - 2²⁸ = 1870812043 is a prime.

It is not a weakly prime, because it can be changed into another prime (2139247459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069623749 + 1069623750.

It is an arithmetic number, because the mean of its divisors is an integer number (1069623750).

Almost surely, 2^2139247499 is an apocalyptic number.

2139247499 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139247499 is an equidigital number, since it uses as much as digits as its factorization.

2139247499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 2139247499 is about 46251.9999459483. Note that the first 4 decimals coincide. The cubic root of 2139247499 is about 1288.5076785737.

The spelling of 2139247499 in words is "two billion, one hundred thirty-nine million, two hundred forty-seven thousand, four hundred ninety-nine".