50639749 has 2 divisors, whose sum is σ = 50639750. Its totient is φ = 50639748.

The previous prime is 50639747. The next prime is 50639777. The reversal of 50639749 is 94793605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43322724 + 7317025 = 6582^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 50639749 - 2¹ = 50639747 is a prime.

Together with 50639747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50639747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25319874 + 25319875.

It is an arithmetic number, because the mean of its divisors is an integer number (25319875).

Almost surely, 2^50639749 is an apocalyptic number.

It is an amenable number.

50639749 is a deficient number, since it is larger than the sum of its proper divisors (1).

50639749 is an equidigital number, since it uses as much as digits as its factorization.

50639749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 50639749 is about 7116.1611139715. The cubic root of 50639749 is about 369.9677327595.

The spelling of 50639749 in words is "fifty million, six hundred thirty-nine thousand, seven hundred forty-nine".