1275820979 has 2 divisors, whose sum is σ = 1275820980. Its totient is φ = 1275820978.

The previous prime is 1275820967. The next prime is 1275821009. The reversal of 1275820979 is 9790285721.

It is a weak prime.

It is an emirp because it is prime and its reverse (9790285721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1275820979 - 2²⁰ = 1274772403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275820919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637910489 + 637910490.

It is an arithmetic number, because the mean of its divisors is an integer number (637910490).

Almost surely, 2^1275820979 is an apocalyptic number.

1275820979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275820979 is an equidigital number, since it uses as much as digits as its factorization.

1275820979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 1275820979 is about 35718.6362981567. The cubic root of 1275820979 is about 1084.5841324962.

The spelling of 1275820979 in words is "one billion, two hundred seventy-five million, eight hundred twenty thousand, nine hundred seventy-nine".