1221361079 has 2 divisors, whose sum is σ = 1221361080. Its totient is φ = 1221361078.

The previous prime is 1221361067. The next prime is 1221361081. The reversal of 1221361079 is 9701631221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221361079 - 2⁸ = 1221360823 is a prime.

Together with 1221361081, 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 (1221331079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610680539 + 610680540.

It is an arithmetic number, because the mean of its divisors is an integer number (610680540).

Almost surely, 2^1221361079 is an apocalyptic number.

1221361079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221361079 is an equidigital number, since it uses as much as digits as its factorization.

1221361079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1221361079 is about 34947.9767511654. The cubic root of 1221361079 is about 1068.9269467793.

The spelling of 1221361079 in words is "one billion, two hundred twenty-one million, three hundred sixty-one thousand, seventy-nine".