51473821 has 8 divisors (see below), whose sum is σ = 58877120. Its totient is φ = 44083008.

The previous prime is 51473803. The next prime is 51473827. The reversal of 51473821 is 12837415.

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 51473821 - 2⁷ = 51473693 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 (51473827) 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, 8725 + ... + 13381.

It is an arithmetic number, because the mean of its divisors is an integer number (7359640).

Almost surely, 2^51473821 is an apocalyptic number.

It is an amenable number.

51473821 is a deficient number, since it is larger than the sum of its proper divisors (7403299).

51473821 is a wasteful number, since it uses less digits than its factorization.

51473821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243.

The product of its digits is 6720, while the sum is 31.

The square root of 51473821 is about 7174.5258379910. The cubic root of 51473821 is about 371.9878907879.

The spelling of 51473821 in words is "fifty-one million, four hundred seventy-three thousand, eight hundred twenty-one".