1172221 has 4 divisors (see below), whose sum is σ = 1174912. Its totient is φ = 1169532.

The previous prime is 1172207. The next prime is 1172233. The reversal of 1172221 is 1222711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1222711 = 7 ⋅174673.

It is a cyclic number.

It is not a de Polignac number, because 1172221 - 2¹¹ = 1170173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1172195 and 1172204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172261) 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, 525 + ... + 1618.

It is an arithmetic number, because the mean of its divisors is an integer number (293728).

2^1172221 is an apocalyptic number.

It is an amenable number.

1172221 is a deficient number, since it is larger than the sum of its proper divisors (2691).

1172221 is an equidigital number, since it uses as much as digits as its factorization.

1172221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690.

The product of its digits is 56, while the sum is 16.

The square root of 1172221 is about 1082.6915534907. The cubic root of 1172221 is about 105.4394582378.

Adding to 1172221 its reverse (1222711), we get a palindrome (2394932).

The spelling of 1172221 in words is "one million, one hundred seventy-two thousand, two hundred twenty-one".