51072181 has 2 divisors, whose sum is σ = 51072182. Its totient is φ = 51072180.

The previous prime is 51072169. The next prime is 51072193. The reversal of 51072181 is 18127015.

51072181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (51072169) and next prime (51072193).

It can be written as a sum of positive squares in only one way, i.e., 35343025 + 15729156 = 5945^2 + 3966^2 .

It is a cyclic number.

It is not a de Polignac number, because 51072181 - 2¹³ = 51063989 is a prime.

It is a super-2 number, since 2×51072181² = 5216735344193522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51073181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25536090 + 25536091.

It is an arithmetic number, because the mean of its divisors is an integer number (25536091).

Almost surely, 2^51072181 is an apocalyptic number.

It is an amenable number.

51072181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51072181 is an equidigital number, since it uses as much as digits as its factorization.

51072181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 51072181 is about 7146.4803225084. The cubic root of 51072181 is about 371.0178475054.

Adding to 51072181 its reverse (18127015), we get a palindrome (69199196).

The spelling of 51072181 in words is "fifty-one million, seventy-two thousand, one hundred eighty-one".