120785813 has 4 divisors (see below), whose sum is σ = 121854828. Its totient is φ = 119716800.

The previous prime is 120785809. The next prime is 120785837. The reversal of 120785813 is 318587021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7086244 + 113699569 = 2662^2 + 10663^2 .

It is a cyclic number.

It is not a de Polignac number, because 120785813 - 2² = 120785809 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 (120788813) 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, 534338 + ... + 534563.

It is an arithmetic number, because the mean of its divisors is an integer number (30463707).

Almost surely, 2^120785813 is an apocalyptic number.

It is an amenable number.

120785813 is a deficient number, since it is larger than the sum of its proper divisors (1069015).

120785813 is a wasteful number, since it uses less digits than its factorization.

120785813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069014.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 120785813 is about 10990.2599150339. The cubic root of 120785813 is about 494.3167296320.

The spelling of 120785813 in words is "one hundred twenty million, seven hundred eighty-five thousand, eight hundred thirteen".