50839781 has 4 divisors (see below), whose sum is σ = 50866272. Its totient is φ = 50813292.

The previous prime is 50839757. The next prime is 50839787. The reversal of 50839781 is 18793805.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18793805 = 5 ⋅3758761.

It is a cyclic number.

It is not a de Polignac number, because 50839781 - 2¹⁰ = 50838757 is a prime.

It is a super-2 number, since 2×50839781² = 5169366664255922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50839787) 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, 10121 + ... + 14286.

It is an arithmetic number, because the mean of its divisors is an integer number (12716568).

Almost surely, 2^50839781 is an apocalyptic number.

It is an amenable number.

50839781 is a deficient number, since it is larger than the sum of its proper divisors (26491).

50839781 is a wasteful number, since it uses less digits than its factorization.

50839781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26490.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 50839781 is about 7130.2020307983. The cubic root of 50839781 is about 370.4542290883.

The spelling of 50839781 in words is "fifty million, eight hundred thirty-nine thousand, seven hundred eighty-one".