1121290999 has 4 divisors (see below), whose sum is σ = 1122190000. Its totient is φ = 1120392000.

The previous prime is 1121290993. The next prime is 1121291011. The reversal of 1121290999 is 9990921211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1121290999 - 2¹⁵ = 1121258231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121290993) 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 in 3 ways as a sum of consecutive naturals, for example, 447627 + ... + 450124.

It is an arithmetic number, because the mean of its divisors is an integer number (280547500).

Almost surely, 2^1121290999 is an apocalyptic number.

1121290999 is a deficient number, since it is larger than the sum of its proper divisors (899001).

1121290999 is an equidigital number, since it uses as much as digits as its factorization.

1121290999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899000.

The product of its (nonzero) digits is 26244, while the sum is 43.

The square root of 1121290999 is about 33485.6834930990. The cubic root of 1121290999 is about 1038.8976852917.

The spelling of 1121290999 in words is "one billion, one hundred twenty-one million, two hundred ninety thousand, nine hundred ninety-nine".