2139217247 has 2 divisors, whose sum is σ = 2139217248. Its totient is φ = 2139217246.

The previous prime is 2139217243. The next prime is 2139217303. The reversal of 2139217247 is 7427129312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2139217247 - 2² = 2139217243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2139217247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139217243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069608623 + 1069608624.

It is an arithmetic number, because the mean of its divisors is an integer number (1069608624).

Almost surely, 2^2139217247 is an apocalyptic number.

2139217247 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139217247 is an equidigital number, since it uses as much as digits as its factorization.

2139217247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 2139217247 is about 46251.6729102851. The cubic root of 2139217247 is about 1288.5016047685.

The spelling of 2139217247 in words is "two billion, one hundred thirty-nine million, two hundred seventeen thousand, two hundred forty-seven".