120209791 has 4 divisors (see below), whose sum is σ = 129456712. Its totient is φ = 110962872.

The previous prime is 120209783. The next prime is 120209863. The reversal of 120209791 is 197902021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197902021 = 4801 ⋅41221.

It is a cyclic number.

It is not a de Polignac number, because 120209791 - 2³ = 120209783 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 (120209701) 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, 4623441 + ... + 4623466.

It is an arithmetic number, because the mean of its divisors is an integer number (32364178).

Almost surely, 2^120209791 is an apocalyptic number.

120209791 is a deficient number, since it is larger than the sum of its proper divisors (9246921).

120209791 is an equidigital number, since it uses as much as digits as its factorization.

120209791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9246920.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 120209791 is about 10964.0225738549. The cubic root of 120209791 is about 493.5296859105.

The spelling of 120209791 in words is "one hundred twenty million, two hundred nine thousand, seven hundred ninety-one".