31261225 has 6 divisors (see below), whose sum is σ = 38763950. Its totient is φ = 25008960.

The previous prime is 31261199. The next prime is 31261277. The reversal of 31261225 is 52216213.

It can be written as a sum of positive squares in 3 ways, for example, as 46656 + 31214569 = 216^2 + 5587^2 .

It is not a de Polignac number, because 31261225 - 2¹¹ = 31259177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31261196 and 31261205.

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 5 ways as a sum of consecutive naturals, for example, 625200 + ... + 625249.

Almost surely, 2^31261225 is an apocalyptic number.

It is an amenable number.

31261225 is a deficient number, since it is larger than the sum of its proper divisors (7502725).

31261225 is a wasteful number, since it uses less digits than its factorization.

31261225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250459 (or 1250454 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 31261225 is about 5591.1738481289. The cubic root of 31261225 is about 315.0179715958.

Adding to 31261225 its reverse (52216213), we get a palindrome (83477438).

The spelling of 31261225 in words is "thirty-one million, two hundred sixty-one thousand, two hundred twenty-five".