49009 has 2 divisors, whose sum is σ = 49010. Its totient is φ = 49008.

The previous prime is 49003. The next prime is 49019. The reversal of 49009 is 90094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25600 + 23409 = 160^2 + 153^2 .

It is a cyclic number.

It is not a de Polignac number, because 49009 - 2⁹ = 48497 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (49003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24504 + 24505.

It is an arithmetic number, because the mean of its divisors is an integer number (24505).

2⁴⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

49009 is a deficient number, since it is larger than the sum of its proper divisors (1).

49009 is an equidigital number, since it uses as much as digits as its factorization.

49009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 49009 is about 221.3797642062. The cubic root of 49009 is about 36.5952973543.

It can be divided in two parts, 4900 and 9, that multiplied together give a square (44100 = 210²).

The spelling of 49009 in words is "forty-nine thousand, nine".