2118993797 has 2 divisors, whose sum is σ = 2118993798. Its totient is φ = 2118993796.

The previous prime is 2118993763. The next prime is 2118993827. The reversal of 2118993797 is 7973998112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1946044996 + 172948801 = 44114^2 + 13151^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118993797 - 2¹⁶ = 2118928261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118993707) 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, 1059496898 + 1059496899.

It is an arithmetic number, because the mean of its divisors is an integer number (1059496899).

Almost surely, 2^2118993797 is an apocalyptic number.

It is an amenable number.

2118993797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118993797 is an equidigital number, since it uses as much as digits as its factorization.

2118993797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 2118993797 is about 46032.5297697183. The cubic root of 2118993797 is about 1284.4283865204.

The spelling of 2118993797 in words is "two billion, one hundred eighteen million, nine hundred ninety-three thousand, seven hundred ninety-seven".