31540225 has 12 divisors (see below), whose sum is σ = 39216240. Its totient is φ = 25163600.

The previous prime is 31540217. The next prime is 31540241. The reversal of 31540225 is 52204513.

It is not a de Polignac number, because 31540225 - 2³ = 31540217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31540196 and 31540205.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8970 + ... + 11980.

It is an arithmetic number, because the mean of its divisors is an integer number (3268020).

Almost surely, 2^31540225 is an apocalyptic number.

It is an amenable number.

31540225 is a deficient number, since it is larger than the sum of its proper divisors (7676015).

31540225 is a wasteful number, since it uses less digits than its factorization.

31540225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440 (or 3435 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 31540225 is about 5616.0684646824. The cubic root of 31540225 is about 315.9523542169.

Adding to 31540225 its reverse (52204513), we get a palindrome (83744738).

The spelling of 31540225 in words is "thirty-one million, five hundred forty thousand, two hundred twenty-five".