49518409 has 4 divisors (see below), whose sum is σ = 49533904. Its totient is φ = 49502916.

The previous prime is 49518323. The next prime is 49518419. The reversal of 49518409 is 90481594.

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 49518409 - 2⁷ = 49518281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49518419) 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, 987 + ... + 10000.

It is an arithmetic number, because the mean of its divisors is an integer number (12383476).

Almost surely, 2^49518409 is an apocalyptic number.

It is an amenable number.

49518409 is a deficient number, since it is larger than the sum of its proper divisors (15495).

49518409 is a wasteful number, since it uses less digits than its factorization.

49518409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15494.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 49518409 is about 7036.9317887841. The cubic root of 49518409 is about 367.2165343053.

The spelling of 49518409 in words is "forty-nine million, five hundred eighteen thousand, four hundred nine".