51543021 has 8 divisors (see below), whose sum is σ = 68884480. Its totient is φ = 34281792.

The previous prime is 51543017. The next prime is 51543043. The reversal of 51543021 is 12034515.

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

It is not a de Polignac number, because 51543021 - 2² = 51543017 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 (51543001) 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, 18541 + ... + 21138.

It is an arithmetic number, because the mean of its divisors is an integer number (8610560).

Almost surely, 2^51543021 is an apocalyptic number.

It is an amenable number.

51543021 is a deficient number, since it is larger than the sum of its proper divisors (17341459).

51543021 is a wasteful number, since it uses less digits than its factorization.

51543021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40115.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51543021 is about 7179.3468365862. The cubic root of 51543021 is about 372.1545129318.

Adding to 51543021 its reverse (12034515), we get a palindrome (63577536).

The spelling of 51543021 in words is "fifty-one million, five hundred forty-three thousand, twenty-one".