51516203 has 4 divisors (see below), whose sum is σ = 53178048. Its totient is φ = 49854360.

The previous prime is 51516187. The next prime is 51516221. The reversal of 51516203 is 30261515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30261515 = 5 ⋅6052303.

It is a cyclic number.

It is not a de Polignac number, because 51516203 - 2⁴ = 51516187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51516293) 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, 830876 + ... + 830937.

It is an arithmetic number, because the mean of its divisors is an integer number (13294512).

Almost surely, 2^51516203 is an apocalyptic number.

51516203 is a deficient number, since it is larger than the sum of its proper divisors (1661845).

51516203 is a wasteful number, since it uses less digits than its factorization.

51516203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661844.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51516203 is about 7177.4788749254. The cubic root of 51516203 is about 372.0899573367.

Adding to 51516203 its reverse (30261515), we get a palindrome (81777718).

The spelling of 51516203 in words is "fifty-one million, five hundred sixteen thousand, two hundred three".