1171191 has 16 divisors (see below), whose sum is σ = 1827584. Its totient is φ = 653184.

The previous prime is 1171189. The next prime is 1171199. The reversal of 1171191 is 1911711.

It is not a de Polignac number, because 1171191 - 2¹ = 1171189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (114224).

2^1171191 is an apocalyptic number.

1171191 is a deficient number, since it is larger than the sum of its proper divisors (656393).

1171191 is a wasteful number, since it uses less digits than its factorization.

1171191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350.

The product of its digits is 63, while the sum is 21.

The square root of 1171191 is about 1082.2157825499. The cubic root of 1171191 is about 105.4085668881.

The spelling of 1171191 in words is "one million, one hundred seventy-one thousand, one hundred ninety-one".