51621202 has 8 divisors (see below), whose sum is σ = 77463036. Its totient is φ = 25800192.

The previous prime is 51621161. The next prime is 51621209. The reversal of 51621202 is 20212615.

51621202 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 2 ways, for example, as 47045881 + 4575321 = 6859^2 + 2139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51621202.

It is not an unprimeable number, because it can be changed into a prime (51621209) 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 in 3 ways as a sum of consecutive naturals, for example, 4978 + ... + 11314.

Almost surely, 2^51621202 is an apocalyptic number.

51621202 is a deficient number, since it is larger than the sum of its proper divisors (25841834).

51621202 is a wasteful number, since it uses less digits than its factorization.

51621202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10412.

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

The square root of 51621202 is about 7184.7896280963. The cubic root of 51621202 is about 372.3425805114.

Adding to 51621202 its reverse (20212615), we get a palindrome (71833817).

The spelling of 51621202 in words is "fifty-one million, six hundred twenty-one thousand, two hundred two".