49171209 has 4 divisors (see below), whose sum is σ = 65561616. Its totient is φ = 32780804.

The previous prime is 49171201. The next prime is 49171237. The reversal of 49171209 is 90217194.

49171209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 49171209 - 2³ = 49171201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49171209.

It is not an unprimeable number, because it can be changed into a prime (49171201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8195199 + ... + 8195204.

It is an arithmetic number, because the mean of its divisors is an integer number (16390404).

Almost surely, 2^49171209 is an apocalyptic number.

It is an amenable number.

49171209 is a deficient number, since it is larger than the sum of its proper divisors (16390407).

49171209 is a wasteful number, since it uses less digits than its factorization.

49171209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16390406.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 49171209 is about 7012.2185505017. The cubic root of 49171209 is about 366.3562701866.

The spelling of 49171209 in words is "forty-nine million, one hundred seventy-one thousand, two hundred nine".