49640209 has 2 divisors, whose sum is σ = 49640210. Its totient is φ = 49640208.

The previous prime is 49640197. The next prime is 49640231. The reversal of 49640209 is 90204694.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 18948609 = 5540^2 + 4353^2 .

It is a cyclic number.

It is not a de Polignac number, because 49640209 - 2⁵ = 49640177 is a prime.

It is not a weakly prime, because it can be changed into another prime (49640009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24820104 + 24820105.

It is an arithmetic number, because the mean of its divisors is an integer number (24820105).

Almost surely, 2^49640209 is an apocalyptic number.

It is an amenable number.

49640209 is a deficient number, since it is larger than the sum of its proper divisors (1).

49640209 is an equidigital number, since it uses as much as digits as its factorization.

49640209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 49640209 is about 7045.5808135313. The cubic root of 49640209 is about 367.5173675597.

The spelling of 49640209 in words is "forty-nine million, six hundred forty thousand, two hundred nine".