49999 has 2 divisors, whose sum is σ = 50000. Its totient is φ = 49998.

The previous prime is 49993. The next prime is 50021. The reversal of 49999 is 99994.

It is a weak prime.

It is a cyclic number.

It is a trimorphic number since its cube, 124992500149999, ends in 49999.

It is not a de Polignac number, because 49999 - 2³ = 49991 is a prime.

49999 is a modest number, since divided by 999 gives 49 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999 + 25000.

It is an arithmetic number, because the mean of its divisors is an integer number (25000).

2⁴⁹⁹⁹⁹ is an apocalyptic number.

49999 is a deficient number, since it is larger than the sum of its proper divisors (1).

49999 is an equidigital number, since it uses as much as digits as its factorization.

49999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 40.

The square root of 49999 is about 223.6045616708. The cubic root of 49999 is about 36.8400693827.

The spelling of 49999 in words is "forty-nine thousand, nine hundred ninety-nine".