909489409921 has 4 divisors (see below), whose sum is σ = 909528084144. Its totient is φ = 909450735700.

The previous prime is 909489409919. The next prime is 909489409951. The reversal of 909489409921 is 129904984909.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 909489409921 - 2¹ = 909489409919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909489409951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19301815 + ... + 19348876.

It is an arithmetic number, because the mean of its divisors is an integer number (227382021036).

Almost surely, 2^909489409921 is an apocalyptic number.

It is an amenable number.

909489409921 is a deficient number, since it is larger than the sum of its proper divisors (38674223).

909489409921 is a wasteful number, since it uses less digits than its factorization.

909489409921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38674222.

The product of its (nonzero) digits is 15116544, while the sum is 64.

The spelling of 909489409921 in words is "nine hundred nine billion, four hundred eighty-nine million, four hundred nine thousand, nine hundred twenty-one".