909444649 has 9 divisors (see below), whose sum is σ = 928559653. Its totient is φ = 890717152.

The previous prime is 909444647. The next prime is 909444749. The reversal of 909444649 is 946444909.

The square root of 909444649 is 30157.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 17347225 + 892097424 = 4165^2 + 29868^2 .

It is not a de Polignac number, because 909444649 - 2¹ = 909444647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909444643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1598037 + ... + 1598605.

Almost surely, 2^909444649 is an apocalyptic number.

909444649 is the 30157-th square number.

909444649 is the 15079-th centered octagonal number.

It is an amenable number.

909444649 is a deficient number, since it is larger than the sum of its proper divisors (19115004).

909444649 is an frugal number, since it uses more digits than its factorization.

909444649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The cubic root of 909444649 is about 968.8549385372.

Multiplying 909444649 by its sum of digits (49), we get a square (44562787801 = 211099²).

The spelling of 909444649 in words is "nine hundred nine million, four hundred forty-four thousand, six hundred forty-nine".