49009999 has 2 divisors, whose sum is σ = 49010000. Its totient is φ = 49009998.

The previous prime is 49009993. The next prime is 49010041. The reversal of 49009999 is 99990094.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49009999 is a prime.

49009999 is a modest number, since divided by 9999 gives 4900 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49009993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24504999 + 24505000.

It is an arithmetic number, because the mean of its divisors is an integer number (24505000).

Almost surely, 2^49009999 is an apocalyptic number.

49009999 is a deficient number, since it is larger than the sum of its proper divisors (1).

49009999 is an equidigital number, since it uses as much as digits as its factorization.

49009999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 49009999 is about 7000.7141778536. The cubic root of 49009999 is about 365.9554600562.

Subtracting from 49009999 its sum of digits (49), we obtain a triangular number (49009950 = T₉₉₀₀).

The spelling of 49009999 in words is "forty-nine million, nine thousand, nine hundred ninety-nine".