1221727079 has 2 divisors, whose sum is σ = 1221727080. Its totient is φ = 1221727078.

The previous prime is 1221727043. The next prime is 1221727097. The reversal of 1221727079 is 9707271221.

Together with next prime (1221727097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221727079 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221727099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610863539 + 610863540.

It is an arithmetic number, because the mean of its divisors is an integer number (610863540).

Almost surely, 2^1221727079 is an apocalyptic number.

1221727079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221727079 is an equidigital number, since it uses as much as digits as its factorization.

1221727079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 38.

The square root of 1221727079 is about 34953.2127135690. The cubic root of 1221727079 is about 1069.0337096896.

The spelling of 1221727079 in words is "one billion, two hundred twenty-one million, seven hundred twenty-seven thousand, seventy-nine".