1221187 has 8 divisors (see below), whose sum is σ = 1402560. Its totient is φ = 1051560.

The previous prime is 1221167. The next prime is 1221193. The reversal of 1221187 is 7811221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221167) 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, 2713 + ... + 3130.

It is an arithmetic number, because the mean of its divisors is an integer number (175320).

2^1221187 is an apocalyptic number.

1221187 is a deficient number, since it is larger than the sum of its proper divisors (181373).

1221187 is a wasteful number, since it uses less digits than its factorization.

1221187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5873.

The product of its digits is 224, while the sum is 22.

The square root of 1221187 is about 1105.0733007362. The cubic root of 1221187 is about 106.8876160112.

The spelling of 1221187 in words is "one million, two hundred twenty-one thousand, one hundred eighty-seven".