1321297279 has 2 divisors, whose sum is σ = 1321297280. Its totient is φ = 1321297278.

The previous prime is 1321297277. The next prime is 1321297301. The reversal of 1321297279 is 9727921231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321297279 - 2¹ = 1321297277 is a prime.

Together with 1321297277, 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 (1321297277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660648639 + 660648640.

It is an arithmetic number, because the mean of its divisors is an integer number (660648640).

Almost surely, 2^1321297279 is an apocalyptic number.

1321297279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321297279 is an equidigital number, since it uses as much as digits as its factorization.

1321297279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 1321297279 is about 36349.6530794999. The cubic root of 1321297279 is about 1097.3205526422.

The spelling of 1321297279 in words is "one billion, three hundred twenty-one million, two hundred ninety-seven thousand, two hundred seventy-nine".