51409543 has 2 divisors, whose sum is σ = 51409544. Its totient is φ = 51409542.

The previous prime is 51409511. The next prime is 51409549. The reversal of 51409543 is 34590415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51409543 - 2⁵ = 51409511 is a prime.

It is a super-2 number, since 2×51409543² = 5285882222937698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51409549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25704771 + 25704772.

It is an arithmetic number, because the mean of its divisors is an integer number (25704772).

Almost surely, 2^51409543 is an apocalyptic number.

51409543 is a deficient number, since it is larger than the sum of its proper divisors (1).

51409543 is an equidigital number, since it uses as much as digits as its factorization.

51409543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 51409543 is about 7170.0448394693. The cubic root of 51409543 is about 371.8329861722.

Adding to 51409543 its reverse (34590415), we get a palindrome (85999958).

The spelling of 51409543 in words is "fifty-one million, four hundred nine thousand, five hundred forty-three".