1305641879 has 2 divisors, whose sum is σ = 1305641880. Its totient is φ = 1305641878.

The previous prime is 1305641863. The next prime is 1305641881. The reversal of 1305641879 is 9781465031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1305641879 - 2⁴ = 1305641863 is a prime.

Together with 1305641881, 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 (1305641819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652820939 + 652820940.

It is an arithmetic number, because the mean of its divisors is an integer number (652820940).

Almost surely, 2^1305641879 is an apocalyptic number.

1305641879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305641879 is an equidigital number, since it uses as much as digits as its factorization.

1305641879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 1305641879 is about 36133.6668357918. Note that the first 3 decimals coincide. The cubic root of 1305641879 is about 1092.9694523776.

The spelling of 1305641879 in words is "one billion, three hundred five million, six hundred forty-one thousand, eight hundred seventy-nine".