50002781 has 4 divisors (see below), whose sum is σ = 50564700. Its totient is φ = 49440864.

The previous prime is 50002753. The next prime is 50002787. The reversal of 50002781 is 18720005.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18720005 = 5 ⋅3744001.

It can be written as a sum of positive squares in 2 ways, for example, as 13942756 + 36060025 = 3734^2 + 6005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50002781 is a prime.

It is a super-2 number, since 2×50002781² = 5000556215467922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50002787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280826 + ... + 281003.

It is an arithmetic number, because the mean of its divisors is an integer number (12641175).

Almost surely, 2^50002781 is an apocalyptic number.

It is an amenable number.

50002781 is a deficient number, since it is larger than the sum of its proper divisors (561919).

50002781 is an equidigital number, since it uses as much as digits as its factorization.

50002781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561918.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 50002781 is about 7071.2644555270. The cubic root of 50002781 is about 368.4099799318.

Adding to 50002781 its reverse (18720005), we get a palindrome (68722786).

The spelling of 50002781 in words is "fifty million, two thousand, seven hundred eighty-one".