51980081 has 2 divisors, whose sum is σ = 51980082. Its totient is φ = 51980080.

The previous prime is 51980059. The next prime is 51980119. The reversal of 51980081 is 18008915.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44089600 + 7890481 = 6640^2 + 2809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51980081 is a prime.

It is a super-2 number, since 2×51980081² = 5403857641533122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51980011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25990040 + 25990041.

It is an arithmetic number, because the mean of its divisors is an integer number (25990041).

Almost surely, 2^51980081 is an apocalyptic number.

It is an amenable number.

51980081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51980081 is an equidigital number, since it uses as much as digits as its factorization.

51980081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 51980081 is about 7209.7212844880. The cubic root of 51980081 is about 373.2034506914.

Adding to 51980081 its reverse (18008915), we get a palindrome (69988996).

The spelling of 51980081 in words is "fifty-one million, nine hundred eighty thousand, eighty-one".