51743521 has 4 divisors (see below), whose sum is σ = 51777792. Its totient is φ = 51709252.

The previous prime is 51743519. The next prime is 51743533. The reversal of 51743521 is 12534715.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51743521 - 2¹ = 51743519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51743521.

It is not an unprimeable number, because it can be changed into a prime (51743551) 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, 14761 + ... + 17926.

It is an arithmetic number, because the mean of its divisors is an integer number (12944448).

Almost surely, 2^51743521 is an apocalyptic number.

It is an amenable number.

51743521 is a deficient number, since it is larger than the sum of its proper divisors (34271).

51743521 is a wasteful number, since it uses less digits than its factorization.

51743521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34270.

The product of its digits is 4200, while the sum is 28.

The square root of 51743521 is about 7193.2969492438. The cubic root of 51743521 is about 372.6364432671.

The spelling of 51743521 in words is "fifty-one million, seven hundred forty-three thousand, five hundred twenty-one".