1181971 has 8 divisors (see below), whose sum is σ = 1422080. Its totient is φ = 959688.

The previous prime is 1181969. The next prime is 1181981. The reversal of 1181971 is 1791811.

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 1181971 - 2¹ = 1181969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4311 + ... + 4576.

It is an arithmetic number, because the mean of its divisors is an integer number (177760).

2^1181971 is an apocalyptic number.

1181971 is a deficient number, since it is larger than the sum of its proper divisors (240109).

1181971 is an equidigital number, since it uses as much as digits as its factorization.

1181971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8913.

The product of its digits is 504, while the sum is 28.

The square root of 1181971 is about 1087.1848968782. The cubic root of 1181971 is about 105.7309839183.

The spelling of 1181971 in words is "one million, one hundred eighty-one thousand, nine hundred seventy-one".