31730225 has 24 divisors (see below), whose sum is σ = 41455680. Its totient is φ = 24045120.

The previous prime is 31730213. The next prime is 31730233. The reversal of 31730225 is 52203713.

It is a de Polignac number, because none of the positive numbers 2^k-31730225 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 31730225.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79727 + ... + 80123.

It is an arithmetic number, because the mean of its divisors is an integer number (1727320).

Almost surely, 2^31730225 is an apocalyptic number.

It is an amenable number.

31730225 is a deficient number, since it is larger than the sum of its proper divisors (9725455).

31730225 is a wasteful number, since it uses less digits than its factorization.

31730225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 31730225 is about 5632.9588139804. The cubic root of 31730225 is about 316.5855224531.

Adding to 31730225 its reverse (52203713), we get a palindrome (83933938).

The spelling of 31730225 in words is "thirty-one million, seven hundred thirty thousand, two hundred twenty-five".