51707891 has 2 divisors, whose sum is σ = 51707892. Its totient is φ = 51707890.

The previous prime is 51707869. The next prime is 51707893. The reversal of 51707891 is 19870715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51707891 - 2¹⁸ = 51445747 is a prime.

Together with 51707893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51707893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25853945 + 25853946.

It is an arithmetic number, because the mean of its divisors is an integer number (25853946).

Almost surely, 2^51707891 is an apocalyptic number.

51707891 is a deficient number, since it is larger than the sum of its proper divisors (1).

51707891 is an equidigital number, since it uses as much as digits as its factorization.

51707891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 51707891 is about 7190.8199115261. The cubic root of 51707891 is about 372.5508925556.

The spelling of 51707891 in words is "fifty-one million, seven hundred seven thousand, eight hundred ninety-one".