31224621 has 4 divisors (see below), whose sum is σ = 41632832. Its totient is φ = 20816412.

The previous prime is 31224587. The next prime is 31224623. The reversal of 31224621 is 12642213.

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 not a de Polignac number, because 31224621 - 2¹¹ = 31222573 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 (31224623) 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, 5204101 + ... + 5204106.

It is an arithmetic number, because the mean of its divisors is an integer number (10408208).

Almost surely, 2^31224621 is an apocalyptic number.

It is an amenable number.

31224621 is a deficient number, since it is larger than the sum of its proper divisors (10408211).

31224621 is a wasteful number, since it uses less digits than its factorization.

31224621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10408210.

The product of its digits is 576, while the sum is 21.

The square root of 31224621 is about 5587.8995159183. The cubic root of 31224621 is about 314.8949712836.

Adding to 31224621 its reverse (12642213), we get a palindrome (43866834).

The spelling of 31224621 in words is "thirty-one million, two hundred twenty-four thousand, six hundred twenty-one".