1158971 has 4 divisors (see below), whose sum is σ = 1264344. Its totient is φ = 1053600.

The previous prime is 1158961. The next prime is 1158977. The reversal of 1158971 is 1798511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1158971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1158977) 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 3 ways as a sum of consecutive naturals, for example, 52670 + ... + 52691.

It is an arithmetic number, because the mean of its divisors is an integer number (316086).

2^1158971 is an apocalyptic number.

1158971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1158971 is a deficient number, since it is larger than the sum of its proper divisors (105373).

1158971 is a wasteful number, since it uses less digits than its factorization.

1158971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105372.

The product of its digits is 2520, while the sum is 32.

The square root of 1158971 is about 1076.5551541839. Note that the first 3 decimals coincide. The cubic root of 1158971 is about 105.0406796269.

Adding to 1158971 its sum of digits (32), we get a triangular number (1159003 = T₁₅₂₂).

The spelling of 1158971 in words is "one million, one hundred fifty-eight thousand, nine hundred seventy-one".