51638203 has 4 divisors (see below), whose sum is σ = 51653448. Its totient is φ = 51622960.

The previous prime is 51638179. The next prime is 51638261. The reversal of 51638203 is 30283615.

51638203 is a nontrivial binomial coefficient, being equal to C(10163, 2).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30283615 = 5 ⋅6056723.

It is a de Polignac number, because none of the positive numbers 2^k-51638203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51638003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 10162.

It is an arithmetic number, because the mean of its divisors is an integer number (12913362).

Almost surely, 2^51638203 is an apocalyptic number.

51638203 is the 10162-nd triangular number.

51638203 is the 3388-th centered nonagonal number.

51638203 is a deficient number, since it is larger than the sum of its proper divisors (15245).

51638203 is a wasteful number, since it uses less digits than its factorization.

51638203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15244.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 51638203 is about 7185.9726551108. The cubic root of 51638203 is about 372.3834519696.

It can be divided in two parts, 5163 and 8203, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 51638203 in words is "fifty-one million, six hundred thirty-eight thousand, two hundred three".