51803125609 has 3 divisors (see below), whose sum is σ = 51803353213. Its totient is φ = 51802898006.

The previous prime is 51803125603. The next prime is 51803125613. The reversal of 51803125609 is 90652130815.

The square root of 51803125609 is 227603.

It is a perfect power (a square), and thus also a powerful number.

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 de Polignac number, because none of the positive numbers 2^k-51803125609 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51803125603) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 113802 + ... + 341404.

Almost surely, 2^51803125609 is an apocalyptic number.

51803125609 is the 227603-rd square number.

51803125609 is the 113802-nd centered octagonal number.

It is an amenable number.

51803125609 is a deficient number, since it is larger than the sum of its proper divisors (227604).

51803125609 is an frugal number, since it uses more digits than its factorization.

51803125609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455206 (or 227603 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 51803125609 in words is "fifty-one billion, eight hundred three million, one hundred twenty-five thousand, six hundred nine".