51644081 has 2 divisors, whose sum is σ = 51644082. Its totient is φ = 51644080.

The previous prime is 51644063. The next prime is 51644093. The reversal of 51644081 is 18044615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51609856 + 34225 = 7184^2 + 185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51644081 is a prime.

It is a super-2 number, since 2×51644081² = 5334222204669122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51644381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822040 + 25822041.

It is an arithmetic number, because the mean of its divisors is an integer number (25822041).

Almost surely, 2^51644081 is an apocalyptic number.

It is an amenable number.

51644081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51644081 is an equidigital number, since it uses as much as digits as its factorization.

51644081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 51644081 is about 7186.3816347311. The cubic root of 51644081 is about 372.3975809591.

Adding to 51644081 its reverse (18044615), we get a palindrome (69688696).

The spelling of 51644081 in words is "fifty-one million, six hundred forty-four thousand, eighty-one".