51728471 has 2 divisors, whose sum is σ = 51728472. Its totient is φ = 51728470.

The previous prime is 51728461. The next prime is 51728473. The reversal of 51728471 is 17482715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51728471 - 2⁶ = 51728407 is a prime.

It is a super-3 number, since 3×51728471³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 51728473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51728473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25864235 + 25864236.

It is an arithmetic number, because the mean of its divisors is an integer number (25864236).

Almost surely, 2^51728471 is an apocalyptic number.

51728471 is a deficient number, since it is larger than the sum of its proper divisors (1).

51728471 is an equidigital number, since it uses as much as digits as its factorization.

51728471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 35.

The square root of 51728471 is about 7192.2507603670. The cubic root of 51728471 is about 372.6003117078.

The spelling of 51728471 in words is "fifty-one million, seven hundred twenty-eight thousand, four hundred seventy-one".