51630203 has 4 divisors (see below), whose sum is σ = 51645048. Its totient is φ = 51615360.

The previous prime is 51630197. The next prime is 51630211. The reversal of 51630203 is 30203615.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51630203 - 2¹⁸ = 51368059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51630253) 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, 923 + ... + 10203.

It is an arithmetic number, because the mean of its divisors is an integer number (12911262).

Almost surely, 2^51630203 is an apocalyptic number.

51630203 is a deficient number, since it is larger than the sum of its proper divisors (14845).

51630203 is an equidigital number, since it uses as much as digits as its factorization.

51630203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14844.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 51630203 is about 7185.4159935247. The cubic root of 51630203 is about 372.3642205912.

Adding to 51630203 its reverse (30203615), we get a palindrome (81833818).

The spelling of 51630203 in words is "fifty-one million, six hundred thirty thousand, two hundred three".