50117781 has 16 divisors (see below), whose sum is σ = 76527104. Its totient is φ = 28579824.

The previous prime is 50117779. The next prime is 50117791. The reversal of 50117781 is 18771105.

It is a happy number.

It is not a de Polignac number, because 50117781 - 2¹ = 50117779 is a prime.

It is a super-2 number, since 2×50117781² = 5023583944727922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50117761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9306 + ... + 13668.

It is an arithmetic number, because the mean of its divisors is an integer number (4782944).

Almost surely, 2^50117781 is an apocalyptic number.

It is an amenable number.

50117781 is a deficient number, since it is larger than the sum of its proper divisors (26409323).

50117781 is a wasteful number, since it uses less digits than its factorization.

50117781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4920.

The product of its (nonzero) digits is 1960, while the sum is 30.

The square root of 50117781 is about 7079.3912873919. The cubic root of 50117781 is about 368.6921956313.

Adding to 50117781 its reverse (18771105), we get a palindrome (68888886).

The spelling of 50117781 in words is "fifty million, one hundred seventeen thousand, seven hundred eighty-one".