51206212 has 12 divisors (see below), whose sum is σ = 91796796. Its totient is φ = 24978560.

The previous prime is 51206201. The next prime is 51206219. The reversal of 51206212 is 21260215.

It can be written as a sum of positive squares in 2 ways, for example, as 12068676 + 39137536 = 3474^2 + 6256^2 .

It is a super-2 number, since 2×51206212² = 5244152294777888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51206212.

It is not an unprimeable number, because it can be changed into a prime (51206219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155953 + ... + 156280.

It is an arithmetic number, because the mean of its divisors is an integer number (7649733).

Almost surely, 2^51206212 is an apocalyptic number.

It is an amenable number.

51206212 is a deficient number, since it is larger than the sum of its proper divisors (40590584).

51206212 is a wasteful number, since it uses less digits than its factorization.

51206212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312278 (or 312276 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51206212 is about 7155.8515915298. The cubic root of 51206212 is about 371.3421235556.

Adding to 51206212 its reverse (21260215), we get a palindrome (72466427).

The spelling of 51206212 in words is "fifty-one million, two hundred six thousand, two hundred twelve".