1221079 has 2 divisors, whose sum is σ = 1221080. Its totient is φ = 1221078.

The previous prime is 1221061. The next prime is 1221083. The reversal of 1221079 is 9701221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221079 is a prime.

It is equal to p₉₄₄₂₃ and since 1221079 and 94423 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610539 + 610540.

It is an arithmetic number, because the mean of its divisors is an integer number (610540).

2^1221079 is an apocalyptic number.

1221079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221079 is an equidigital number, since it uses as much as digits as its factorization.

1221079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1221079 is about 1105.0244341190. The cubic root of 1221079 is about 106.8844649233.

The spelling of 1221079 in words is "one million, two hundred twenty-one thousand, seventy-nine".