51401543 has 4 divisors (see below), whose sum is σ = 53174040. Its totient is φ = 49629048.

The previous prime is 51401533. The next prime is 51401611. The reversal of 51401543 is 34510415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34510415 = 5 ⋅6902083.

It is a cyclic number.

It is not a de Polignac number, because 51401543 - 2²² = 47207239 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 (51401513) 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, 886205 + ... + 886262.

It is an arithmetic number, because the mean of its divisors is an integer number (13293510).

Almost surely, 2^51401543 is an apocalyptic number.

51401543 is a deficient number, since it is larger than the sum of its proper divisors (1772497).

51401543 is a wasteful number, since it uses less digits than its factorization.

51401543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772496.

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

The square root of 51401543 is about 7169.4869411974. The cubic root of 51401543 is about 371.8136978065.

Adding to 51401543 its reverse (34510415), we get a palindrome (85911958).

The spelling of 51401543 in words is "fifty-one million, four hundred one thousand, five hundred forty-three".