31243100212 has 6 divisors (see below), whose sum is σ = 54675425378. Its totient is φ = 15621550104.

The previous prime is 31243100209. The next prime is 31243100257. The reversal of 31243100212 is 21200134213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18193693456 + 13049406756 = 134884^2 + 114234^2 .

It is a super-2 number, since 2×31243100212² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31243100212.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3905387523 + ... + 3905387530.

Almost surely, 2^31243100212 is an apocalyptic number.

It is an amenable number.

31243100212 is a deficient number, since it is larger than the sum of its proper divisors (23432325166).

31243100212 is a wasteful number, since it uses less digits than its factorization.

31243100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7810775057 (or 7810775055 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31243100212 its reverse (21200134213), we get a palindrome (52443234425).

The spelling of 31243100212 in words is "thirty-one billion, two hundred forty-three million, one hundred thousand, two hundred twelve".