771117091 has 4 divisors (see below), whose sum is σ = 771927192. Its totient is φ = 770306992.

The previous prime is 771117077. The next prime is 771117097. The reversal of 771117091 is 190711177.

771117091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190711177 = 1663 ⋅114679.

It is a cyclic number.

It is not a de Polignac number, because 771117091 - 2¹⁵ = 771084323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (771117097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403621 + ... + 405526.

It is an arithmetic number, because the mean of its divisors is an integer number (192981798).

Almost surely, 2^771117091 is an apocalyptic number.

771117091 is a deficient number, since it is larger than the sum of its proper divisors (810101).

771117091 is an equidigital number, since it uses as much as digits as its factorization.

771117091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810100.

The product of its (nonzero) digits is 3087, while the sum is 34.

The square root of 771117091 is about 27768.9951384633. The cubic root of 771117091 is about 917.0086724855.

The spelling of 771117091 in words is "seven hundred seventy-one million, one hundred seventeen thousand, ninety-one".