1192978091 has 2 divisors, whose sum is σ = 1192978092. Its totient is φ = 1192978090.

The previous prime is 1192978079. The next prime is 1192978109. The reversal of 1192978091 is 1908792911.

Together with next prime (1192978109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1192978091 - 2¹⁰ = 1192977067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1192978001) 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, 596489045 + 596489046.

It is an arithmetic number, because the mean of its divisors is an integer number (596489046).

Almost surely, 2^1192978091 is an apocalyptic number.

1192978091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1192978091 is an equidigital number, since it uses as much as digits as its factorization.

1192978091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 47.

The square root of 1192978091 is about 34539.5149213187. The cubic root of 1192978091 is about 1060.5817653166.

The spelling of 1192978091 in words is "one billion, one hundred ninety-two million, nine hundred seventy-eight thousand, ninety-one".