120999811 has 4 divisors (see below), whose sum is σ = 121120272. Its totient is φ = 120879352.

The previous prime is 120999799. The next prime is 120999817. The reversal of 120999811 is 118999021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118999021 = 179 ⋅664799.

It is a cyclic number.

It is not a de Polignac number, because 120999811 - 2⁹ = 120999299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120999817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58711 + ... + 60736.

It is an arithmetic number, because the mean of its divisors is an integer number (30280068).

Almost surely, 2^120999811 is an apocalyptic number.

120999811 is a deficient number, since it is larger than the sum of its proper divisors (120461).

120999811 is a wasteful number, since it uses less digits than its factorization.

120999811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120460.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 120999811 is about 10999.9914090876. The cubic root of 120999811 is about 494.6084868012.

The spelling of 120999811 in words is "one hundred twenty million, nine hundred ninety-nine thousand, eight hundred eleven".