51180581 has 2 divisors, whose sum is σ = 51180582. Its totient is φ = 51180580.

The previous prime is 51180541. The next prime is 51180593. The reversal of 51180581 is 18508115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 58081 = 7150^2 + 241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51180581 is a prime.

It is a super-2 number, since 2×51180581² = 5238903742995122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51180511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25590290 + 25590291.

It is an arithmetic number, because the mean of its divisors is an integer number (25590291).

Almost surely, 2^51180581 is an apocalyptic number.

It is an amenable number.

51180581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51180581 is an equidigital number, since it uses as much as digits as its factorization.

51180581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 51180581 is about 7154.0604554337. The cubic root of 51180581 is about 371.2801554331.

Adding to 51180581 its reverse (18508115), we get a palindrome (69688696).

The spelling of 51180581 in words is "fifty-one million, one hundred eighty thousand, five hundred eighty-one".