1321200079 has 2 divisors, whose sum is σ = 1321200080. Its totient is φ = 1321200078.

The previous prime is 1321200077. The next prime is 1321200103. The reversal of 1321200079 is 9700021231.

It is a weak prime.

It is an emirp because it is prime and its reverse (9700021231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321200079 - 2¹ = 1321200077 is a prime.

Together with 1321200077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321200073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660600039 + 660600040.

It is an arithmetic number, because the mean of its divisors is an integer number (660600040).

Almost surely, 2^1321200079 is an apocalyptic number.

1321200079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321200079 is an equidigital number, since it uses as much as digits as its factorization.

1321200079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 1321200079 is about 36348.3160407742. The cubic root of 1321200079 is about 1097.2936441952.

The spelling of 1321200079 in words is "one billion, three hundred twenty-one million, two hundred thousand, seventy-nine".