51184781 has 2 divisors, whose sum is σ = 51184782. Its totient is φ = 51184780.

The previous prime is 51184747. The next prime is 51184799. The reversal of 51184781 is 18748115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 902500 = 7091^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 51184781 - 2¹⁰ = 51183757 is a prime.

It is a super-2 number, since 2×51184781² = 5239763612035922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51184711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25592390 + 25592391.

It is an arithmetic number, because the mean of its divisors is an integer number (25592391).

Almost surely, 2^51184781 is an apocalyptic number.

It is an amenable number.

51184781 is a deficient number, since it is larger than the sum of its proper divisors (1).

51184781 is an equidigital number, since it uses as much as digits as its factorization.

51184781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 35.

The square root of 51184781 is about 7154.3539890056. The cubic root of 51184781 is about 371.2903111990.

The spelling of 51184781 in words is "fifty-one million, one hundred eighty-four thousand, seven hundred eighty-one".