31226225 has 6 divisors (see below), whose sum is σ = 38720550. Its totient is φ = 24980960.

The previous prime is 31226219. The next prime is 31226227. The reversal of 31226225 is 52262213.

It can be written as a sum of positive squares in 3 ways, for example, as 4765489 + 26460736 = 2183^2 + 5144^2 .

It is not a de Polignac number, because 31226225 - 2¹² = 31222129 is a prime.

It is a super-3 number, since 3×31226225³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31226225.

It is not an unprimeable number, because it can be changed into a prime (31226227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 624500 + ... + 624549.

It is an arithmetic number, because the mean of its divisors is an integer number (6453425).

Almost surely, 2^31226225 is an apocalyptic number.

It is an amenable number.

31226225 is a deficient number, since it is larger than the sum of its proper divisors (7494325).

31226225 is a wasteful number, since it uses less digits than its factorization.

31226225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249059 (or 1249054 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 31226225 is about 5588.0430384885. The cubic root of 31226225 is about 314.9003632133.

Adding to 31226225 its reverse (52262213), we get a palindrome (83488438).

The spelling of 31226225 in words is "thirty-one million, two hundred twenty-six thousand, two hundred twenty-five".