1200109091 has 2 divisors, whose sum is σ = 1200109092. Its totient is φ = 1200109090.

The previous prime is 1200109081. The next prime is 1200109093. The reversal of 1200109091 is 1909010021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200109091 - 2¹⁰ = 1200108067 is a prime.

Together with 1200109093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1200109093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600054545 + 600054546.

It is an arithmetic number, because the mean of its divisors is an integer number (600054546).

Almost surely, 2^1200109091 is an apocalyptic number.

1200109091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200109091 is an equidigital number, since it uses as much as digits as its factorization.

1200109091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1200109091 is about 34642.5907085483. The cubic root of 1200109091 is about 1062.6907700085.

The spelling of 1200109091 in words is "one billion, two hundred million, one hundred nine thousand, ninety-one".