51205412 has 12 divisors (see below), whose sum is σ = 90837516. Its totient is φ = 25251840.

The previous prime is 51205379. The next prime is 51205417. The reversal of 51205412 is 21450215.

It can be written as a sum of positive squares in 2 ways, for example, as 39740416 + 11464996 = 6304^2 + 3386^2 .

It is not an unprimeable number, because it can be changed into a prime (51205417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87389 + ... + 87972.

It is an arithmetic number, because the mean of its divisors is an integer number (7569793).

Almost surely, 2^51205412 is an apocalyptic number.

It is an amenable number.

51205412 is a deficient number, since it is larger than the sum of its proper divisors (39632104).

51205412 is a wasteful number, since it uses less digits than its factorization.

51205412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175438 (or 175436 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51205412 is about 7155.7956930030. The cubic root of 51205412 is about 371.3401897066.

Adding to 51205412 its reverse (21450215), we get a palindrome (72655627).

The spelling of 51205412 in words is "fifty-one million, two hundred five thousand, four hundred twelve".