50891917 has 4 divisors (see below), whose sum is σ = 50942880. Its totient is φ = 50840956.

The previous prime is 50891887. The next prime is 50891921. The reversal of 50891917 is 71919805.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 50891917 - 2²³ = 42503309 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 50891917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50891017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23953 + ... + 25990.

It is an arithmetic number, because the mean of its divisors is an integer number (12735720).

Almost surely, 2^50891917 is an apocalyptic number.

It is an amenable number.

50891917 is a deficient number, since it is larger than the sum of its proper divisors (50963).

50891917 is a wasteful number, since it uses less digits than its factorization.

50891917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50962.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 50891917 is about 7133.8570913637. The cubic root of 50891917 is about 370.5808189550.

The spelling of 50891917 in words is "fifty million, eight hundred ninety-one thousand, nine hundred seventeen".