51091543 has 2 divisors, whose sum is σ = 51091544. Its totient is φ = 51091542.

The previous prime is 51091519. The next prime is 51091567. The reversal of 51091543 is 34519015.

51091543 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 (51091519) and next prime (51091567).

It is a cyclic number.

It is not a de Polignac number, because 51091543 - 2⁹ = 51091031 is a prime.

It is a super-2 number, since 2×51091543² = 5220691532241698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51091643) 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, 25545771 + 25545772.

It is an arithmetic number, because the mean of its divisors is an integer number (25545772).

Almost surely, 2^51091543 is an apocalyptic number.

51091543 is a deficient number, since it is larger than the sum of its proper divisors (1).

51091543 is an equidigital number, since it uses as much as digits as its factorization.

51091543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 51091543 is about 7147.8348470009. The cubic root of 51091543 is about 371.0647271687.

The spelling of 51091543 in words is "fifty-one million, ninety-one thousand, five hundred forty-three".