51705791 has 2 divisors, whose sum is σ = 51705792. Its totient is φ = 51705790.

The previous prime is 51705769. The next prime is 51705809. The reversal of 51705791 is 19750715.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51705791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51705701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25852895 + 25852896.

It is an arithmetic number, because the mean of its divisors is an integer number (25852896).

Almost surely, 2^51705791 is an apocalyptic number.

51705791 is a deficient number, since it is larger than the sum of its proper divisors (1).

51705791 is an equidigital number, since it uses as much as digits as its factorization.

51705791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11025, while the sum is 35.

The square root of 51705791 is about 7190.6738905335. The cubic root of 51705791 is about 372.5458490477.

The spelling of 51705791 in words is "fifty-one million, seven hundred five thousand, seven hundred ninety-one".