50221561 has 6 divisors (see below), whose sum is σ = 54382110. Its totient is φ = 46358208.

The previous prime is 50221559. The next prime is 50221573. The reversal of 50221561 is 16512205.

It can be written as a sum of positive squares in 3 ways, for example, as 6661561 + 43560000 = 2581^2 + 6600^2 .

It is not a de Polignac number, because 50221561 - 2¹ = 50221559 is a prime.

It is a super-3 number, since 3×50221561³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50221861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148416 + ... + 148753.

It is an arithmetic number, because the mean of its divisors is an integer number (9063685).

Almost surely, 2^50221561 is an apocalyptic number.

It is an amenable number.

50221561 is a deficient number, since it is larger than the sum of its proper divisors (4160549).

50221561 is a wasteful number, since it uses less digits than its factorization.

50221561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297195 (or 297182 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 50221561 is about 7086.7172230871. The cubic root of 50221561 is about 368.9465065435.

Adding to 50221561 its reverse (16512205), we get a palindrome (66733766).

The spelling of 50221561 in words is "fifty million, two hundred twenty-one thousand, five hundred sixty-one".