7117878091 has 2 divisors, whose sum is σ = 7117878092. Its totient is φ = 7117878090.

The previous prime is 7117878077. The next prime is 7117878137. The reversal of 7117878091 is 1908787117.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7117878091 - 2¹⁵ = 7117845323 is a prime.

It is not a weakly prime, because it can be changed into another prime (7117878041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3558939045 + 3558939046.

It is an arithmetic number, because the mean of its divisors is an integer number (3558939046).

Almost surely, 2^7117878091 is an apocalyptic number.

7117878091 is a deficient number, since it is larger than the sum of its proper divisors (1).

7117878091 is an equidigital number, since it uses as much as digits as its factorization.

7117878091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 49.

The square root of 7117878091 is about 84367.5179853005. The cubic root of 7117878091 is about 1923.6092133067.

The spelling of 7117878091 in words is "seven billion, one hundred seventeen million, eight hundred seventy-eight thousand, ninety-one".