31200212 has 6 divisors (see below), whose sum is σ = 54600378. Its totient is φ = 15600104.

The previous prime is 31200209. The next prime is 31200233. The reversal of 31200212 is 21200213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19061956 + 12138256 = 4366^2 + 3484^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31200193 and 31200202.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3900023 + ... + 3900030.

It is an arithmetic number, because the mean of its divisors is an integer number (9100063).

Almost surely, 2^31200212 is an apocalyptic number.

It is an amenable number.

31200212 is a deficient number, since it is larger than the sum of its proper divisors (23400166).

31200212 is a wasteful number, since it uses less digits than its factorization.

31200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800057 (or 7800055 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31200212 is about 5585.7149945195. The cubic root of 31200212 is about 314.8128963608.

Adding to 31200212 its reverse (21200213), we get a palindrome (52400425).

Subtracting from 31200212 its reverse (21200213), we obtain a palindrome (9999999).

The spelling of 31200212 in words is "thirty-one million, two hundred thousand, two hundred twelve".