1211279 has 2 divisors, whose sum is σ = 1211280. Its totient is φ = 1211278.

The previous prime is 1211261. The next prime is 1211281. The reversal of 1211279 is 9721121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211279 - 2¹⁶ = 1145743 is a prime.

It is a Sophie Germain prime.

Together with 1211281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211179) 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 as a sum of consecutive naturals, namely, 605639 + 605640.

It is an arithmetic number, because the mean of its divisors is an integer number (605640).

2^1211279 is an apocalyptic number.

1211279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211279 is an equidigital number, since it uses as much as digits as its factorization.

1211279 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 1211279 is about 1100.5812100886. The cubic root of 1211279 is about 106.5977560550.

The spelling of 1211279 in words is "one million, two hundred eleven thousand, two hundred seventy-nine".