51809061 has 16 divisors (see below), whose sum is σ = 70257600. Its totient is φ = 33955200.

The previous prime is 51809057. The next prime is 51809063. The reversal of 51809061 is 16090815.

It is a happy number.

It is not a de Polignac number, because 51809061 - 2² = 51809057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51809063) 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, 48865 + ... + 49913.

It is an arithmetic number, because the mean of its divisors is an integer number (4391100).

Almost surely, 2^51809061 is an apocalyptic number.

It is an amenable number.

51809061 is a deficient number, since it is larger than the sum of its proper divisors (18448539).

51809061 is a wasteful number, since it uses less digits than its factorization.

51809061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 51809061 is about 7197.8511376660. The cubic root of 51809061 is about 372.7937079693.

Adding to 51809061 its reverse (16090815), we get a palindrome (67899876).

It can be divided in two parts, 5180 and 9061, that added together give a palindrome (14241).

The spelling of 51809061 in words is "fifty-one million, eight hundred nine thousand, sixty-one".