1211199999 has 8 divisors (see below), whose sum is σ = 1617553200. Its totient is φ = 806156736.

The previous prime is 1211199971. The next prime is 1211200009. The reversal of 1211199999 is 9999911121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211199999 - 2¹⁵ = 1211167231 is a prime.

1211199999 is a modest number, since divided by 99999 gives 12111 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211199919) 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 7 ways as a sum of consecutive naturals, for example, 325324 + ... + 329025.

It is an arithmetic number, because the mean of its divisors is an integer number (202194150).

Almost surely, 2^1211199999 is an apocalyptic number.

1211199999 is a deficient number, since it is larger than the sum of its proper divisors (406353201).

1211199999 is an equidigital number, since it uses as much as digits as its factorization.

1211199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654969.

The product of its digits is 118098, while the sum is 51.

The square root of 1211199999 is about 34802.2987602831. The cubic root of 1211199999 is about 1065.9543852883.

The spelling of 1211199999 in words is "one billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred ninety-nine".