50918909 has 2 divisors, whose sum is σ = 50918910. Its totient is φ = 50918908.

The previous prime is 50918899. The next prime is 50918911. The reversal of 50918909 is 90981905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49042009 + 1876900 = 7003^2 + 1370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50918909 is a prime.

Together with 50918911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50918929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25459454 + 25459455.

It is an arithmetic number, because the mean of its divisors is an integer number (25459455).

Almost surely, 2^50918909 is an apocalyptic number.

It is an amenable number.

50918909 is a deficient number, since it is larger than the sum of its proper divisors (1).

50918909 is an equidigital number, since it uses as much as digits as its factorization.

50918909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 50918909 is about 7135.7486642958. The cubic root of 50918909 is about 370.6463234606.

The spelling of 50918909 in words is "fifty million, nine hundred eighteen thousand, nine hundred nine".