1191589879 has 2 divisors, whose sum is σ = 1191589880. Its totient is φ = 1191589878.

The previous prime is 1191589843. The next prime is 1191589897. The reversal of 1191589879 is 9789851911.

Together with next prime (1191589897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191589879 - 2⁹ = 1191589367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191589979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595794939 + 595794940.

It is an arithmetic number, because the mean of its divisors is an integer number (595794940).

Almost surely, 2^1191589879 is an apocalyptic number.

1191589879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191589879 is an equidigital number, since it uses as much as digits as its factorization.

1191589879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 58.

The square root of 1191589879 is about 34519.4130743847. The cubic root of 1191589879 is about 1060.1702227519.

The spelling of 1191589879 in words is "one billion, one hundred ninety-one million, five hundred eighty-nine thousand, eight hundred seventy-nine".