50687729 has 2 divisors, whose sum is σ = 50687730. Its totient is φ = 50687728.

The previous prime is 50687717. The next prime is 50687731. The reversal of 50687729 is 92778605.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50410000 + 277729 = 7100^2 + 527^2 .

It is a cyclic number.

It is not a de Polignac number, because 50687729 - 2⁸ = 50687473 is a prime.

It is a Sophie Germain prime.

Together with 50687731, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 50687729.

It is not a weakly prime, because it can be changed into another prime (50687629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25343864 + 25343865.

It is an arithmetic number, because the mean of its divisors is an integer number (25343865).

Almost surely, 2^50687729 is an apocalyptic number.

It is an amenable number.

50687729 is a deficient number, since it is larger than the sum of its proper divisors (1).

50687729 is an equidigital number, since it uses as much as digits as its factorization.

50687729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 50687729 is about 7119.5315154861. The cubic root of 50687729 is about 370.0845411882.

The spelling of 50687729 in words is "fifty million, six hundred eighty-seven thousand, seven hundred twenty-nine".