1122109991 has 2 divisors, whose sum is σ = 1122109992. Its totient is φ = 1122109990.

The previous prime is 1122109987. The next prime is 1122109997. The reversal of 1122109991 is 1999012211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1122109991 - 2² = 1122109987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122109997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561054995 + 561054996.

It is an arithmetic number, because the mean of its divisors is an integer number (561054996).

Almost surely, 2^1122109991 is an apocalyptic number.

1122109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122109991 is an equidigital number, since it uses as much as digits as its factorization.

1122109991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 1122109991 is about 33497.9102482528. The cubic root of 1122109991 is about 1039.1505610169.

The spelling of 1122109991 in words is "one billion, one hundred twenty-two million, one hundred nine thousand, nine hundred ninety-one".