1221169 has 4 divisors (see below), whose sum is σ = 1234980. Its totient is φ = 1207360.

The previous prime is 1221167. The next prime is 1221193. The reversal of 1221169 is 9611221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9611221 = 61 ⋅157561.

It can be written as a sum of positive squares in 2 ways, for example, as 245025 + 976144 = 495^2 + 988^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221169 - 2¹ = 1221167 is a prime.

It is a super-2 number, since 2×1221169² = 2982507453122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6772 + ... + 6949.

It is an arithmetic number, because the mean of its divisors is an integer number (308745).

2^1221169 is an apocalyptic number.

It is an amenable number.

1221169 is a deficient number, since it is larger than the sum of its proper divisors (13811).

1221169 is an equidigital number, since it uses as much as digits as its factorization.

1221169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13810.

The product of its digits is 216, while the sum is 22.

The square root of 1221169 is about 1105.0651564501. The cubic root of 1221169 is about 106.8870908428.

The spelling of 1221169 in words is "one million, two hundred twenty-one thousand, one hundred sixty-nine".