50018681 has 2 divisors, whose sum is σ = 50018682. Its totient is φ = 50018680.

The previous prime is 50018653. The next prime is 50018699. The reversal of 50018681 is 18681005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39488656 + 10530025 = 6284^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 50018681 - 2²² = 45824377 is a prime.

It is a super-2 number, since 2×50018681² = 5003736897959522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (50018081) 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 as a sum of consecutive naturals, namely, 25009340 + 25009341.

It is an arithmetic number, because the mean of its divisors is an integer number (25009341).

Almost surely, 2^50018681 is an apocalyptic number.

It is an amenable number.

50018681 is a deficient number, since it is larger than the sum of its proper divisors (1).

50018681 is an equidigital number, since it uses as much as digits as its factorization.

50018681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 50018681 is about 7072.3886346835. The cubic root of 50018681 is about 368.4490250795.

Adding to 50018681 its reverse (18681005), we get a palindrome (68699686).

The spelling of 50018681 in words is "fifty million, eighteen thousand, six hundred eighty-one".