31542225 has 96 divisors (see below), whose sum is σ = 65245824. Its totient is φ = 13209600.

The previous prime is 31542197. The next prime is 31542229. The reversal of 31542225 is 52224513.

It is not a de Polignac number, because 31542225 - 2¹³ = 31534033 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31542195 and 31542204.

It is not an unprimeable number, because it can be changed into a prime (31542229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 182239 + ... + 182411.

It is an arithmetic number, because the mean of its divisors is an integer number (679644).

Almost surely, 2^31542225 is an apocalyptic number.

It is an amenable number.

31542225 is an abundant number, since it is smaller than the sum of its proper divisors (33703599).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31542225 is a wasteful number, since it uses less digits than its factorization.

31542225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 222 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 31542225 is about 5616.2465223671. The cubic root of 31542225 is about 315.9590323699.

Adding to 31542225 its reverse (52224513), we get a palindrome (83766738).

The spelling of 31542225 in words is "thirty-one million, five hundred forty-two thousand, two hundred twenty-five".