1221197 has 2 divisors, whose sum is σ = 1221198. Its totient is φ = 1221196.

The previous prime is 1221193. The next prime is 1221221. The reversal of 1221197 is 7911221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972196 + 249001 = 986^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221197 - 2² = 1221193 is a prime.

It is a super-2 number, since 2×1221197² = 2982644225618, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is equal to p₉₄₄₃₃ and since 1221197 and 94433 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610598 + 610599.

It is an arithmetic number, because the mean of its divisors is an integer number (610599).

2^1221197 is an apocalyptic number.

It is an amenable number.

1221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221197 is an equidigital number, since it uses as much as digits as its factorization.

1221197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 23.

The square root of 1221197 is about 1105.0778253137. The cubic root of 1221197 is about 106.8879077692.

The spelling of 1221197 in words is "one million, two hundred twenty-one thousand, one hundred ninety-seven".