1321111279 has 2 divisors, whose sum is σ = 1321111280. Its totient is φ = 1321111278.

The previous prime is 1321111261. The next prime is 1321111291. The reversal of 1321111279 is 9721111231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321111279 - 2⁷ = 1321111151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321111079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660555639 + 660555640.

It is an arithmetic number, because the mean of its divisors is an integer number (660555640).

Almost surely, 2^1321111279 is an apocalyptic number.

1321111279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321111279 is an equidigital number, since it uses as much as digits as its factorization.

1321111279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 28.

The square root of 1321111279 is about 36347.0945056135. The cubic root of 1321111279 is about 1097.2690600159.

The spelling of 1321111279 in words is "one billion, three hundred twenty-one million, one hundred eleven thousand, two hundred seventy-nine".