51809043 has 16 divisors (see below), whose sum is σ = 81156096. Its totient is φ = 28983840.

The previous prime is 51809039. The next prime is 51809057. The reversal of 51809043 is 34090815.

It is not a de Polignac number, because 51809043 - 2² = 51809039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51809043.

It is not an unprimeable number, because it can be changed into a prime (51809033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59955 + ... + 60812.

It is an arithmetic number, because the mean of its divisors is an integer number (5072256).

Almost surely, 2^51809043 is an apocalyptic number.

51809043 is a deficient number, since it is larger than the sum of its proper divisors (29347053).

51809043 is a wasteful number, since it uses less digits than its factorization.

51809043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120794.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51809043 is about 7197.8498872927. The cubic root of 51809043 is about 372.7936647961.

Adding to 51809043 its reverse (34090815), we get a palindrome (85899858).

The spelling of 51809043 in words is "fifty-one million, eight hundred nine thousand, forty-three".