1171991711 has 8 divisors (see below), whose sum is σ = 1279200000. Its totient is φ = 1064894040.

The previous prime is 1171991701. The next prime is 1171991741.

1171991711 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1171991711 - 2⁶ = 1171991647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171991701) 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, 4661 + ... + 48638.

It is an arithmetic number, because the mean of its divisors is an integer number (159900000).

Almost surely, 2^1171991711 is an apocalyptic number.

1171991711 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1171991711 is a deficient number, since it is larger than the sum of its proper divisors (107208289).

1171991711 is a wasteful number, since it uses less digits than its factorization.

1171991711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55309.

The product of its digits is 3969, while the sum is 38.

The square root of 1171991711 is about 34234.3644748957. The cubic root of 1171991711 is about 1054.3258305968.

The spelling of 1171991711 in words is "one billion, one hundred seventy-one million, nine hundred ninety-one thousand, seven hundred eleven".