50206781 has 2 divisors, whose sum is σ = 50206782. Its totient is φ = 50206780.

The previous prime is 50206753. The next prime is 50206789. The reversal of 50206781 is 18760205.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43099225 + 7107556 = 6565^2 + 2666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50206781 is a prime.

It is a super-2 number, since 2×50206781² = 5041441716763922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50206789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25103390 + 25103391.

It is an arithmetic number, because the mean of its divisors is an integer number (25103391).

Almost surely, 2^50206781 is an apocalyptic number.

It is an amenable number.

50206781 is a deficient number, since it is larger than the sum of its proper divisors (1).

50206781 is an equidigital number, since it uses as much as digits as its factorization.

50206781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 50206781 is about 7085.6743504059. The cubic root of 50206781 is about 368.9103098431.

Adding to 50206781 its reverse (18760205), we get a palindrome (68966986).

The spelling of 50206781 in words is "fifty million, two hundred six thousand, seven hundred eighty-one".