1221229 has 4 divisors (see below), whose sum is σ = 1293084. Its totient is φ = 1149376.

The previous prime is 1221223. The next prime is 1221239. The reversal of 1221229 is 9221221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 828100 + 393129 = 910^2 + 627^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221229 - 2³ = 1221221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221) 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, 35902 + ... + 35935.

It is an arithmetic number, because the mean of its divisors is an integer number (323271).

2^1221229 is an apocalyptic number.

It is an amenable number.

1221229 is a deficient number, since it is larger than the sum of its proper divisors (71855).

1221229 is an equidigital number, since it uses as much as digits as its factorization.

1221229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71854.

The product of its digits is 144, while the sum is 19.

The square root of 1221229 is about 1105.0923038371. The cubic root of 1221229 is about 106.8888413841. Note that the first 4 decimals are identical.

The spelling of 1221229 in words is "one million, two hundred twenty-one thousand, two hundred twenty-nine".