31225223 has 4 divisors (see below), whose sum is σ = 31240560. Its totient is φ = 31209888.

The previous prime is 31225213. The next prime is 31225247. The reversal of 31225223 is 32252213.

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

It is a cyclic number.

It is not a de Polignac number, because 31225223 - 2¹⁰ = 31224199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31225195 and 31225204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31225213) 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, 4043 + ... + 8876.

It is an arithmetic number, because the mean of its divisors is an integer number (7810140).

Almost surely, 2^31225223 is an apocalyptic number.

31225223 is a deficient number, since it is larger than the sum of its proper divisors (15337).

31225223 is a wasteful number, since it uses less digits than its factorization.

31225223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15336.

The product of its digits is 720, while the sum is 20.

The square root of 31225223 is about 5587.9533820532. The cubic root of 31225223 is about 314.8969949596.

Adding to 31225223 its reverse (32252213), we get a palindrome (63477436).

The spelling of 31225223 in words is "thirty-one million, two hundred twenty-five thousand, two hundred twenty-three".