51921543 has 8 divisors (see below), whose sum is σ = 69288048. Its totient is φ = 34584704.

The previous prime is 51921533. The next prime is 51921577. The reversal of 51921543 is 34512915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51921543 - 2¹² = 51917447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51921543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51921523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2946 + ... + 10607.

It is an arithmetic number, because the mean of its divisors is an integer number (8661006).

Almost surely, 2^51921543 is an apocalyptic number.

51921543 is a deficient number, since it is larger than the sum of its proper divisors (17366505).

51921543 is a wasteful number, since it uses less digits than its factorization.

51921543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14833.

The product of its digits is 5400, while the sum is 30.

The square root of 51921543 is about 7205.6604832590. The cubic root of 51921543 is about 373.0633022009.

The spelling of 51921543 in words is "fifty-one million, nine hundred twenty-one thousand, five hundred forty-three".