31220245225 has 12 divisors (see below), whose sum is σ = 41691035596. Its totient is φ = 23054950080.

The previous prime is 31220245223. The next prime is 31220245237. The reversal of 31220245225 is 52254202213.

It can be written as a sum of positive squares in 6 ways, for example, as 3922266384 + 27297978841 = 62628^2 + 165221^2 .

It is not a de Polignac number, because 31220245225 - 2¹ = 31220245223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220245193 and 31220245202.

It is not an unprimeable number, because it can be changed into a prime (31220245223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48030822 + ... + 48031471.

Almost surely, 2^31220245225 is an apocalyptic number.

It is an amenable number.

31220245225 is a deficient number, since it is larger than the sum of its proper divisors (10470790371).

31220245225 is a wasteful number, since it uses less digits than its factorization.

31220245225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96062316 (or 96062311 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 31220245225 its reverse (52254202213), we get a palindrome (83474447438).

The spelling of 31220245225 in words is "thirty-one billion, two hundred twenty million, two hundred forty-five thousand, two hundred twenty-five".