2139198647 has 2 divisors, whose sum is σ = 2139198648. Its totient is φ = 2139198646.

The previous prime is 2139198583. The next prime is 2139198671. The reversal of 2139198647 is 7468919312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2139198647 - 2⁶ = 2139198583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2139198595 and 2139198604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139191647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069599323 + 1069599324.

It is an arithmetic number, because the mean of its divisors is an integer number (1069599324).

Almost surely, 2^2139198647 is an apocalyptic number.

2139198647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139198647 is an equidigital number, since it uses as much as digits as its factorization.

2139198647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 2139198647 is about 46251.4718360400. The cubic root of 2139198647 is about 1288.4978703497.

The spelling of 2139198647 in words is "two billion, one hundred thirty-nine million, one hundred ninety-eight thousand, six hundred forty-seven".