31224005 has 8 divisors (see below), whose sum is σ = 37548672. Its totient is φ = 24925968.

The previous prime is 31223989. The next prime is 31224007. The reversal of 31224005 is 50042213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31224005 - 2⁴ = 31223989 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 3977 + ... + 8846.

It is an arithmetic number, because the mean of its divisors is an integer number (4693584).

Almost surely, 2^31224005 is an apocalyptic number.

It is an amenable number.

31224005 is a deficient number, since it is larger than the sum of its proper divisors (6324667).

31224005 is a wasteful number, since it uses less digits than its factorization.

31224005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13315.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 31224005 is about 5587.8443965451. The cubic root of 31224005 is about 314.8929005183.

Adding to 31224005 its reverse (50042213), we get a palindrome (81266218).

The spelling of 31224005 in words is "thirty-one million, two hundred twenty-four thousand, five".