1121009999 has 2 divisors, whose sum is σ = 1121010000. Its totient is φ = 1121009998.

The previous prime is 1121009963. The next prime is 1121010061. The reversal of 1121009999 is 9999001211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121009999 - 2¹² = 1121005903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121009909) 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, 560504999 + 560505000.

It is an arithmetic number, because the mean of its divisors is an integer number (560505000).

Almost surely, 2^1121009999 is an apocalyptic number.

1121009999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121009999 is an equidigital number, since it uses as much as digits as its factorization.

1121009999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 41.

The square root of 1121009999 is about 33481.4874072225. The cubic root of 1121009999 is about 1038.8108940723.

The spelling of 1121009999 in words is "one billion, one hundred twenty-one million, nine thousand, nine hundred ninety-nine".