1170991 has 8 divisors (see below), whose sum is σ = 1224000. Its totient is φ = 1118880.

The previous prime is 1170979. The next prime is 1171031. The reversal of 1170991 is 1990711.

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 1170991 - 2⁷ = 1170863 is a prime.

It is a super-3 number, since 3×1170991³ = 4817058563332656813, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1170941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4186 + ... + 4456.

It is an arithmetic number, because the mean of its divisors is an integer number (153000).

2^1170991 is an apocalyptic number.

1170991 is a deficient number, since it is larger than the sum of its proper divisors (53009).

1170991 is a wasteful number, since it uses less digits than its factorization.

1170991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 1170991 is about 1082.1233755908. The cubic root of 1170991 is about 105.4025664682.

The spelling of 1170991 in words is "one million, one hundred seventy thousand, nine hundred ninety-one".