920441809 has 4 divisors (see below), whose sum is σ = 1051933504. Its totient is φ = 788950116.

The previous prime is 920441783. The next prime is 920441813. The reversal of 920441809 is 908144029.

It is a happy number.

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 920441809 - 2¹⁹ = 919917521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920441309) 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, 65745837 + ... + 65745850.

It is an arithmetic number, because the mean of its divisors is an integer number (262983376).

Almost surely, 2^920441809 is an apocalyptic number.

It is an amenable number.

920441809 is a deficient number, since it is larger than the sum of its proper divisors (131491695).

920441809 is a wasteful number, since it uses less digits than its factorization.

920441809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131491694.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 920441809 is about 30338.7839077310. The cubic root of 920441809 is about 972.7444891648.

The spelling of 920441809 in words is "nine hundred twenty million, four hundred forty-one thousand, eight hundred nine".