51212072 has 8 divisors (see below), whose sum is σ = 96022650. Its totient is φ = 25606032.

The previous prime is 51212071. The next prime is 51212081. The reversal of 51212072 is 27021215.

51212072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 43112356 + 8099716 = 6566^2 + 2846^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51212071) by changing a digit.

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, 3200747 + ... + 3200762.

Almost surely, 2^51212072 is an apocalyptic number.

It is an amenable number.

51212072 is a deficient number, since it is larger than the sum of its proper divisors (44810578).

51212072 is a wasteful number, since it uses less digits than its factorization.

51212072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6401515 (or 6401511 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 51212072 is about 7156.2610349260. The cubic root of 51212072 is about 371.3562883854.

Adding to 51212072 its reverse (27021215), we get a palindrome (78233287).

The spelling of 51212072 in words is "fifty-one million, two hundred twelve thousand, seventy-two".