1171997 has 8 divisors (see below), whose sum is σ = 1259712. Its totient is φ = 1086400.

The previous prime is 1171991. The next prime is 1171999. The reversal of 1171997 is 7991711.

It is a happy number.

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 1171997 - 2⁴ = 1171981 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 (1171991) 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, 722 + ... + 1692.

It is an arithmetic number, because the mean of its divisors is an integer number (157464).

2^1171997 is an apocalyptic number.

1171997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1171997 is a deficient number, since it is larger than the sum of its proper divisors (87715).

1171997 is an equidigital number, since it uses as much as digits as its factorization.

1171997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059.

The product of its digits is 3969, while the sum is 35.

The square root of 1171997 is about 1082.5881026503. The cubic root of 1171997 is about 105.4327416592.

The spelling of 1171997 in words is "one million, one hundred seventy-one thousand, nine hundred ninety-seven".