31544352225 has 72 divisors (see below), whose sum is σ = 59008098240. Its totient is φ = 16077959040.

The previous prime is 31544352223. The next prime is 31544352233. The reversal of 31544352225 is 52225344513.

31544352225 is a `hidden beast` number, since 31 + 54 + 4 + 352 + 225 = 666.

It is not a de Polignac number, because 31544352225 - 2¹ = 31544352223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31544352225.

It is not an unprimeable number, because it can be changed into a prime (31544352223) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 8345386 + ... + 8349164.

It is an arithmetic number, because the mean of its divisors is an integer number (819556920).

Almost surely, 2^31544352225 is an apocalyptic number.

It is an amenable number.

31544352225 is a deficient number, since it is larger than the sum of its proper divisors (27463746015).

31544352225 is a wasteful number, since it uses less digits than its factorization.

31544352225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431 (or 5423 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

Adding to 31544352225 its reverse (52225344513), we get a palindrome (83769696738).

The spelling of 31544352225 in words is "thirty-one billion, five hundred forty-four million, three hundred fifty-two thousand, two hundred twenty-five".