2139218177791 has 2 divisors, whose sum is σ = 2139218177792. Its totient is φ = 2139218177790.

The previous prime is 2139218177777. The next prime is 2139218177801. The reversal of 2139218177791 is 1977718129312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139218177791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139218177741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069609088895 + 1069609088896.

It is an arithmetic number, because the mean of its divisors is an integer number (1069609088896).

Almost surely, 2^{2139218177791} is an apocalyptic number.

2139218177791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139218177791 is an equidigital number, since it uses as much as digits as its factorization.

2139218177791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2667168, while the sum is 58.

The spelling of 2139218177791 in words is "two trillion, one hundred thirty-nine billion, two hundred eighteen million, one hundred seventy-seven thousand, seven hundred ninety-one".