51405143 has 4 divisors (see below), whose sum is σ = 51422280. Its totient is φ = 51388008.

The previous prime is 51405131. The next prime is 51405187. The reversal of 51405143 is 34150415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51405143 - 2¹⁸ = 51142999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51408143) 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 in 3 ways as a sum of consecutive naturals, for example, 2753 + ... + 10506.

It is an arithmetic number, because the mean of its divisors is an integer number (12855570).

Almost surely, 2^51405143 is an apocalyptic number.

51405143 is a deficient number, since it is larger than the sum of its proper divisors (17137).

51405143 is a wasteful number, since it uses less digits than its factorization.

51405143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17136.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 51405143 is about 7169.7380007919. The cubic root of 51405143 is about 371.8223778187.

Adding to 51405143 its reverse (34150415), we get a palindrome (85555558).

The spelling of 51405143 in words is "fifty-one million, four hundred five thousand, one hundred forty-three".