1158221 has 8 divisors (see below), whose sum is σ = 1246080. Its totient is φ = 1073088.

The previous prime is 1158217. The next prime is 1158247. The reversal of 1158221 is 1228511.

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 1158221 - 2² = 1158217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1158193 and 1158202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158251) 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, 245 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (155760).

2^1158221 is an apocalyptic number.

It is an amenable number.

1158221 is a deficient number, since it is larger than the sum of its proper divisors (87859).

1158221 is a wasteful number, since it uses less digits than its factorization.

1158221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363.

The product of its digits is 160, while the sum is 20.

The square root of 1158221 is about 1076.2067645206. The cubic root of 1158221 is about 105.0180165607.

The spelling of 1158221 in words is "one million, one hundred fifty-eight thousand, two hundred twenty-one".