31435225 has 6 divisors (see below), whose sum is σ = 38979710. Its totient is φ = 25148160.

The previous prime is 31435219. The next prime is 31435241. The reversal of 31435225 is 52253413.

It can be written as a sum of positive squares in 3 ways, for example, as 41616 + 31393609 = 204^2 + 5603^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31435225 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1257409 = 31435225 / (3 + 1 + 4 + 3 + 5 + 2 + 2 + 5).

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 31435225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628680 + ... + 628729.

Almost surely, 2^31435225 is an apocalyptic number.

It is an amenable number.

31435225 is a deficient number, since it is larger than the sum of its proper divisors (7544485).

31435225 is a wasteful number, since it uses less digits than its factorization.

31435225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257419 (or 1257414 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 31435225 is about 5606.7124948583. The cubic root of 31435225 is about 315.6013539780.

Adding to 31435225 its reverse (52253413), we get a palindrome (83688638).

The spelling of 31435225 in words is "thirty-one million, four hundred thirty-five thousand, two hundred twenty-five".