51967821 has 8 divisors (see below), whose sum is σ = 69926560. Its totient is φ = 34327152.

The previous prime is 51967807. The next prime is 51967829. The reversal of 51967821 is 12876915.

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

It is not a de Polignac number, because 51967821 - 2⁶ = 51967757 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 51967821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51967829) 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, 79135 + ... + 79788.

It is an arithmetic number, because the mean of its divisors is an integer number (8740820).

Almost surely, 2^51967821 is an apocalyptic number.

It is an amenable number.

51967821 is a deficient number, since it is larger than the sum of its proper divisors (17958739).

51967821 is a wasteful number, since it uses less digits than its factorization.

51967821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159035.

The product of its digits is 30240, while the sum is 39.

The square root of 51967821 is about 7208.8709934358. The cubic root of 51967821 is about 373.1741071814.

The spelling of 51967821 in words is "fifty-one million, nine hundred sixty-seven thousand, eight hundred twenty-one".