51705739 has 2 divisors, whose sum is σ = 51705740. Its totient is φ = 51705738.

The previous prime is 51705733. The next prime is 51705743. The reversal of 51705739 is 93750715.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51705739 - 2⁷ = 51705611 is a prime.

It is a super-2 number, since 2×51705739² = 5346966891072242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51705698 and 51705707.

It is not a weakly prime, because it can be changed into another prime (51705733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25852869 + 25852870.

It is an arithmetic number, because the mean of its divisors is an integer number (25852870).

Almost surely, 2^51705739 is an apocalyptic number.

51705739 is a deficient number, since it is larger than the sum of its proper divisors (1).

51705739 is an equidigital number, since it uses as much as digits as its factorization.

51705739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33075, while the sum is 37.

The square root of 51705739 is about 7190.6702747380. The cubic root of 51705739 is about 372.5457241591.

The spelling of 51705739 in words is "fifty-one million, seven hundred five thousand, seven hundred thirty-nine".