49805909 has 4 divisors (see below), whose sum is σ = 49823916. Its totient is φ = 49787904.

The previous prime is 49805891. The next prime is 49805923. The reversal of 49805909 is 90950894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90950894 = 2 ⋅45475447.

It can be written as a sum of positive squares in 2 ways, for example, as 26234884 + 23571025 = 5122^2 + 4855^2 .

It is a cyclic number.

It is not a de Polignac number, because 49805909 - 2²⁴ = 33028693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 49805909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49805969) 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, 3884 + ... + 10709.

It is an arithmetic number, because the mean of its divisors is an integer number (12455979).

Almost surely, 2^49805909 is an apocalyptic number.

It is an amenable number.

49805909 is a deficient number, since it is larger than the sum of its proper divisors (18007).

49805909 is a wasteful number, since it uses less digits than its factorization.

49805909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18006.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 49805909 is about 7057.3301609036. The cubic root of 49805909 is about 367.9258401484.

The spelling of 49805909 in words is "forty-nine million, eight hundred five thousand, nine hundred nine".