31224009 has 16 divisors (see below), whose sum is σ = 42775040. Its totient is φ = 20252160.

The previous prime is 31224007. The next prime is 31224023. The reversal of 31224009 is 90042213.

It is not a de Polignac number, because 31224009 - 2¹ = 31224007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31224007) 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 15 ways as a sum of consecutive naturals, for example, 16872 + ... + 18630.

It is an arithmetic number, because the mean of its divisors is an integer number (2673440).

Almost surely, 2^31224009 is an apocalyptic number.

It is an amenable number.

31224009 is a deficient number, since it is larger than the sum of its proper divisors (11551031).

31224009 is a wasteful number, since it uses less digits than its factorization.

31224009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 31224009 is about 5587.8447544648. The cubic root of 31224009 is about 314.8929139650.

The spelling of 31224009 in words is "thirty-one million, two hundred twenty-four thousand, nine".