1171077891 has 8 divisors (see below), whose sum is σ = 1563121680. Its totient is φ = 779876352.

The previous prime is 1171077883. The next prime is 1171077893. The reversal of 1171077891 is 1987701711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1171077891 - 2³ = 1171077883 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1171077893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207310 + ... + 212883.

It is an arithmetic number, because the mean of its divisors is an integer number (195390210).

Almost surely, 2^1171077891 is an apocalyptic number.

1171077891 is a deficient number, since it is larger than the sum of its proper divisors (392043789).

1171077891 is an equidigital number, since it uses as much as digits as its factorization.

1171077891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421125.

The product of its (nonzero) digits is 24696, while the sum is 42.

The square root of 1171077891 is about 34221.0153414536. The cubic root of 1171077891 is about 1054.0517346457.

The spelling of 1171077891 in words is "one billion, one hundred seventy-one million, seventy-seven thousand, eight hundred ninety-one".