50018509 has 2 divisors, whose sum is σ = 50018510. Its totient is φ = 50018508.

The previous prime is 50018477. The next prime is 50018513. The reversal of 50018509 is 90581005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34257609 + 15760900 = 5853^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 50018509 - 2⁵ = 50018477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50018209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25009254 + 25009255.

It is an arithmetic number, because the mean of its divisors is an integer number (25009255).

Almost surely, 2^50018509 is an apocalyptic number.

It is an amenable number.

50018509 is a deficient number, since it is larger than the sum of its proper divisors (1).

50018509 is an equidigital number, since it uses as much as digits as its factorization.

50018509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 50018509 is about 7072.3764747078. The cubic root of 50018509 is about 368.4486027486.

The spelling of 50018509 in words is "fifty million, eighteen thousand, five hundred nine".