31224423 has 4 divisors (see below), whose sum is σ = 41632568. Its totient is φ = 20816280.

The previous prime is 31224383. The next prime is 31224433. The reversal of 31224423 is 32442213.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-31224423 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 31224423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31224433) 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, 5204068 + ... + 5204073.

It is an arithmetic number, because the mean of its divisors is an integer number (10408142).

Almost surely, 2^31224423 is an apocalyptic number.

31224423 is a deficient number, since it is larger than the sum of its proper divisors (10408145).

31224423 is a wasteful number, since it uses less digits than its factorization.

31224423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10408144.

The product of its digits is 1152, while the sum is 21.

The square root of 31224423 is about 5587.8817990362. The cubic root of 31224423 is about 314.8943056834.

Adding to 31224423 its reverse (32442213), we get a palindrome (63666636).

The spelling of 31224423 in words is "thirty-one million, two hundred twenty-four thousand, four hundred twenty-three".