49518009 has 18 divisors (see below), whose sum is σ = 75493626. Its totient is φ = 31272480.

The previous prime is 49517987. The next prime is 49518013. The reversal of 49518009 is 90081594.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 2732409 = 6840^2 + 1653^2 .

It is not a de Polignac number, because 49518009 - 2⁹ = 49517497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (49518019) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4372 + ... + 10869.

Almost surely, 2^49518009 is an apocalyptic number.

It is an amenable number.

49518009 is a deficient number, since it is larger than the sum of its proper divisors (25975617).

49518009 is a wasteful number, since it uses less digits than its factorization.

49518009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15285 (or 15263 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 49518009 is about 7036.9033672490. The cubic root of 49518009 is about 367.2155455349.

The spelling of 49518009 in words is "forty-nine million, five hundred eighteen thousand, nine".