1279559191 has 2 divisors, whose sum is σ = 1279559192. Its totient is φ = 1279559190.

The previous prime is 1279559189. The next prime is 1279559209. The reversal of 1279559191 is 1919559721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1279559191 - 2¹ = 1279559189 is a prime.

Together with 1279559189, 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 (1279559101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639779595 + 639779596.

It is an arithmetic number, because the mean of its divisors is an integer number (639779596).

Almost surely, 2^1279559191 is an apocalyptic number.

1279559191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279559191 is an equidigital number, since it uses as much as digits as its factorization.

1279559191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 255150, while the sum is 49.

The square root of 1279559191 is about 35770.9266164577. The cubic root of 1279559191 is about 1085.6423927737.

The spelling of 1279559191 in words is "one billion, two hundred seventy-nine million, five hundred fifty-nine thousand, one hundred ninety-one".