49991209 has 2 divisors, whose sum is σ = 49991210. Its totient is φ = 49991208.

The previous prime is 49991197. The next prime is 49991219. The reversal of 49991209 is 90219994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46963609 + 3027600 = 6853^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 49991209 - 2²³ = 41602601 is a prime.

It is not a weakly prime, because it can be changed into another prime (49991219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24995604 + 24995605.

It is an arithmetic number, because the mean of its divisors is an integer number (24995605).

Almost surely, 2^49991209 is an apocalyptic number.

It is an amenable number.

49991209 is a deficient number, since it is larger than the sum of its proper divisors (1).

49991209 is an equidigital number, since it uses as much as digits as its factorization.

49991209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 49991209 is about 7070.4461669685. The cubic root of 49991209 is about 368.3815577179.

The spelling of 49991209 in words is "forty-nine million, nine hundred ninety-one thousand, two hundred nine".