844149509 has 6 divisors (see below), whose sum is σ = 981969894. Its totient is φ = 723556680.

The previous prime is 844149479. The next prime is 844149529. The reversal of 844149509 is 905941448.

It can be written as a sum of positive squares in only one way, i.e., 843902500 + 247009 = 29050^2 + 497^2 .

It is not a de Polignac number, because 844149509 - 2⁸ = 844149253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 844149509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844149529) 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, 8613722 + ... + 8613819.

It is an arithmetic number, because the mean of its divisors is an integer number (163661649).

Almost surely, 2^844149509 is an apocalyptic number.

It is an amenable number.

844149509 is a deficient number, since it is larger than the sum of its proper divisors (137820385).

844149509 is a wasteful number, since it uses less digits than its factorization.

844149509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17227555 (or 17227548 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 844149509 is about 29054.2511347307. The cubic root of 844149509 is about 945.0899045695.

The spelling of 844149509 in words is "eight hundred forty-four million, one hundred forty-nine thousand, five hundred nine".