51521543 has 16 divisors (see below), whose sum is σ = 56318976. Its totient is φ = 46940160.

The previous prime is 51521539. The next prime is 51521549. The reversal of 51521543 is 34512515.

It is a cyclic number.

It is not a de Polignac number, because 51521543 - 2² = 51521539 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 (51521549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134330 + ... + 134712.

It is an arithmetic number, because the mean of its divisors is an integer number (3519936).

Almost surely, 2^51521543 is an apocalyptic number.

51521543 is a deficient number, since it is larger than the sum of its proper divisors (4797433).

51521543 is a wasteful number, since it uses less digits than its factorization.

51521543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634.

The product of its digits is 3000, while the sum is 26.

The square root of 51521543 is about 7177.8508622010. The cubic root of 51521543 is about 372.1028134325.

Subtracting from 51521543 its reverse (34512515), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 51521543 in words is "fifty-one million, five hundred twenty-one thousand, five hundred forty-three".