1321201279 has 2 divisors, whose sum is σ = 1321201280. Its totient is φ = 1321201278.

The previous prime is 1321201267. The next prime is 1321201303. The reversal of 1321201279 is 9721021231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321201279 - 2²⁹ = 784330367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321201229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660600639 + 660600640.

It is an arithmetic number, because the mean of its divisors is an integer number (660600640).

Almost surely, 2^1321201279 is an apocalyptic number.

1321201279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321201279 is an equidigital number, since it uses as much as digits as its factorization.

1321201279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1321201279 is about 36348.3325477249. The cubic root of 1321201279 is about 1097.2939764063.

The spelling of 1321201279 in words is "one billion, three hundred twenty-one million, two hundred one thousand, two hundred seventy-nine".