51688771 has 2 divisors, whose sum is σ = 51688772. Its totient is φ = 51688770.

The previous prime is 51688753. The next prime is 51688807. The reversal of 51688771 is 17788615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51688771 - 2⁵ = 51688739 is a prime.

It is not a weakly prime, because it can be changed into another prime (51688711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25844385 + 25844386.

It is an arithmetic number, because the mean of its divisors is an integer number (25844386).

Almost surely, 2^51688771 is an apocalyptic number.

51688771 is a deficient number, since it is larger than the sum of its proper divisors (1).

51688771 is an equidigital number, since it uses as much as digits as its factorization.

51688771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 43.

The square root of 51688771 is about 7189.4903157317. The cubic root of 51688771 is about 372.5049675779.

The spelling of 51688771 in words is "fifty-one million, six hundred eighty-eight thousand, seven hundred seventy-one".