909393921 has 6 divisors (see below), whose sum is σ = 1313569010. Its totient is φ = 606262608.

The previous prime is 909393911. The next prime is 909393949. The reversal of 909393921 is 129393909.

It can be written as a sum of positive squares in only one way, i.e., 846810000 + 62583921 = 29100^2 + 7911^2 .

It is not a de Polignac number, because 909393921 - 2⁵ = 909393889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909393911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50521876 + ... + 50521893.

Almost surely, 2^909393921 is an apocalyptic number.

It is an amenable number.

909393921 is a deficient number, since it is larger than the sum of its proper divisors (404175089).

909393921 is a wasteful number, since it uses less digits than its factorization.

909393921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101043775 (or 101043772 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 909393921 is about 30156.1589231785. The cubic root of 909393921 is about 968.8369242515.

The spelling of 909393921 in words is "nine hundred nine million, three hundred ninety-three thousand, nine hundred twenty-one".