50811809 has 4 divisors (see below), whose sum is σ = 50829504. Its totient is φ = 50794116.

The previous prime is 50811797. The next prime is 50811851. The reversal of 50811809 is 90811805.

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 a de Polignac number, because none of the positive numbers 2^k-50811809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50819809) 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, 3437 + ... + 10650.

It is an arithmetic number, because the mean of its divisors is an integer number (12707376).

Almost surely, 2^50811809 is an apocalyptic number.

It is an amenable number.

50811809 is a deficient number, since it is larger than the sum of its proper divisors (17695).

50811809 is a wasteful number, since it uses less digits than its factorization.

50811809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17694.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 50811809 is about 7128.2402456707. The cubic root of 50811809 is about 370.3862754339.

The spelling of 50811809 in words is "fifty million, eight hundred eleven thousand, eight hundred nine".