50128181 has 2 divisors, whose sum is σ = 50128182. Its totient is φ = 50128180.

The previous prime is 50128171. The next prime is 50128187. The reversal of 50128181 is 18182105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49420900 + 707281 = 7030^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 50128181 - 2¹⁰ = 50127157 is a prime.

It is a super-2 number, since 2×50128181² = 5025669060737522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 50128181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50128187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25064090 + 25064091.

It is an arithmetic number, because the mean of its divisors is an integer number (25064091).

Almost surely, 2^50128181 is an apocalyptic number.

It is an amenable number.

50128181 is a deficient number, since it is larger than the sum of its proper divisors (1).

50128181 is an equidigital number, since it uses as much as digits as its factorization.

50128181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 50128181 is about 7080.1257757190. The cubic root of 50128181 is about 368.7176964520.

It can be divided in two parts, 501 and 28181, that added together give a palindrome (28682).

The spelling of 50128181 in words is "fifty million, one hundred twenty-eight thousand, one hundred eighty-one".