50971809 has 24 divisors (see below), whose sum is σ = 79666848. Its totient is φ = 28902720.

The previous prime is 50971807. The next prime is 50971819. The reversal of 50971809 is 90817905.

It is a happy number.

It is not a de Polignac number, because 50971809 - 2¹ = 50971807 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (50971801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18874 + ... + 21404.

It is an arithmetic number, because the mean of its divisors is an integer number (3319452).

Almost surely, 2^50971809 is an apocalyptic number.

It is an amenable number.

50971809 is a deficient number, since it is larger than the sum of its proper divisors (28695039).

50971809 is a wasteful number, since it uses less digits than its factorization.

50971809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685 (or 2678 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 50971809 is about 7139.4543909181. The cubic root of 50971809 is about 370.7746346963.

The spelling of 50971809 in words is "fifty million, nine hundred seventy-one thousand, eight hundred nine".