51216202 has 4 divisors (see below), whose sum is σ = 76824306. Its totient is φ = 25608100.

The previous prime is 51216197. The next prime is 51216203. The reversal of 51216202 is 20261215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34821801 + 16394401 = 5901^2 + 4049^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51216202.

It is not an unprimeable number, because it can be changed into a prime (51216203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12804049 + ... + 12804052.

Almost surely, 2^51216202 is an apocalyptic number.

51216202 is a deficient number, since it is larger than the sum of its proper divisors (25608104).

51216202 is a wasteful number, since it uses less digits than its factorization.

51216202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25608103.

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

The square root of 51216202 is about 7156.5495876155. The cubic root of 51216202 is about 371.3662707990.

Adding to 51216202 its reverse (20261215), we get a palindrome (71477417).

The spelling of 51216202 in words is "fifty-one million, two hundred sixteen thousand, two hundred two".