31224109 has 4 divisors (see below), whose sum is σ = 35684704. Its totient is φ = 26763516.

The previous prime is 31224091. The next prime is 31224113. The reversal of 31224109 is 90142213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31224109 - 2¹⁷ = 31093037 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 31224109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31224199) 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, 2230287 + ... + 2230300.

It is an arithmetic number, because the mean of its divisors is an integer number (8921176).

Almost surely, 2^31224109 is an apocalyptic number.

It is an amenable number.

31224109 is a deficient number, since it is larger than the sum of its proper divisors (4460595).

31224109 is an equidigital number, since it uses as much as digits as its factorization.

31224109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460594.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 31224109 is about 5587.8537024514. The cubic root of 31224109 is about 314.8932501300.

The spelling of 31224109 in words is "thirty-one million, two hundred twenty-four thousand, one hundred nine".