50216581 has 4 divisors (see below), whose sum is σ = 50295564. Its totient is φ = 50137600.

The previous prime is 50216557. The next prime is 50216591. The reversal of 50216581 is 18561205.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42185025 + 8031556 = 6495^2 + 2834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50216581 is a prime.

It is a super-2 number, since 2×50216581² = 5043410014659122, 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 (50216501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38530 + ... + 39811.

It is an arithmetic number, because the mean of its divisors is an integer number (12573891).

Almost surely, 2^50216581 is an apocalyptic number.

It is an amenable number.

50216581 is a deficient number, since it is larger than the sum of its proper divisors (78983).

50216581 is an equidigital number, since it uses as much as digits as its factorization.

50216581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78982.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 50216581 is about 7086.3658528191. The cubic root of 50216581 is about 368.9343111551.

Adding to 50216581 its reverse (18561205), we get a palindrome (68777786).

The spelling of 50216581 in words is "fifty million, two hundred sixteen thousand, five hundred eighty-one".