920784091 has 4 divisors (see below), whose sum is σ = 926964000. Its totient is φ = 914604184.

The previous prime is 920784071. The next prime is 920784131. The reversal of 920784091 is 190487029.

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

It is a cyclic number.

It is not a de Polignac number, because 920784091 - 2⁹ = 920783579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920784071) 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, 3089731 + ... + 3090028.

It is an arithmetic number, because the mean of its divisors is an integer number (231741000).

Almost surely, 2^920784091 is an apocalyptic number.

920784091 is a deficient number, since it is larger than the sum of its proper divisors (6179909).

920784091 is a wasteful number, since it uses less digits than its factorization.

920784091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179908.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 920784091 is about 30344.4243807656. The cubic root of 920784091 is about 972.8650514365.

It can be divided in two parts, 92078 and 4091, that added together give a palindrome (96169).

The spelling of 920784091 in words is "nine hundred twenty million, seven hundred eighty-four thousand, ninety-one".