1200100999 has 2 divisors, whose sum is σ = 1200101000. Its totient is φ = 1200100998.

The previous prime is 1200100973. The next prime is 1200101011. The reversal of 1200100999 is 9990010021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200100999 - 2⁷ = 1200100871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200100999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200100949) 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, 600050499 + 600050500.

It is an arithmetic number, because the mean of its divisors is an integer number (600050500).

Almost surely, 2^1200100999 is an apocalyptic number.

1200100999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200100999 is an equidigital number, since it uses as much as digits as its factorization.

1200100999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1200100999 is about 34642.4739157007. The cubic root of 1200100999 is about 1062.6883815276.

The spelling of 1200100999 in words is "one billion, two hundred million, one hundred thousand, nine hundred ninety-nine".