51688471 has 2 divisors, whose sum is σ = 51688472. Its totient is φ = 51688470.

The previous prime is 51688463. The next prime is 51688513. The reversal of 51688471 is 17488615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51688471 - 2³ = 51688463 is a prime.

It is a super-3 number, since 3×51688471³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51688271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25844235 + 25844236.

It is an arithmetic number, because the mean of its divisors is an integer number (25844236).

Almost surely, 2^51688471 is an apocalyptic number.

51688471 is a deficient number, since it is larger than the sum of its proper divisors (1).

51688471 is an equidigital number, since it uses as much as digits as its factorization.

51688471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 40.

The square root of 51688471 is about 7189.4694519137. The cubic root of 51688471 is about 372.5042469074.

The spelling of 51688471 in words is "fifty-one million, six hundred eighty-eight thousand, four hundred seventy-one".