11123121091 has 2 divisors, whose sum is σ = 11123121092. Its totient is φ = 11123121090.

The previous prime is 11123121007. The next prime is 11123121109. The reversal of 11123121091 is 19012132111.

Together with next prime (11123121109) 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 11123121091 - 2⁷ = 11123120963 is a prime.

It is not a weakly prime, because it can be changed into another prime (11123121491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561560545 + 5561560546.

It is an arithmetic number, because the mean of its divisors is an integer number (5561560546).

Almost surely, 2^11123121091 is an apocalyptic number.

11123121091 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123121091 is an equidigital number, since it uses as much as digits as its factorization.

11123121091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 22.

The spelling of 11123121091 in words is "eleven billion, one hundred twenty-three million, one hundred twenty-one thousand, ninety-one".