48991999 has 4 divisors (see below), whose sum is σ = 55990864. Its totient is φ = 41993136.

The previous prime is 48991963. The next prime is 48992003. The reversal of 48991999 is 99919984.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 48991999 - 2⁷ = 48991871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (48991939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3499422 + ... + 3499435.

It is an arithmetic number, because the mean of its divisors is an integer number (13997716).

Almost surely, 2^48991999 is an apocalyptic number.

48991999 is a deficient number, since it is larger than the sum of its proper divisors (6998865).

48991999 is an equidigital number, since it uses as much as digits as its factorization.

48991999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6998864.

The product of its digits is 1889568, while the sum is 58.

The square root of 48991999 is about 6999.4284766686. The cubic root of 48991999 is about 365.9106528399.

The spelling of 48991999 in words is "forty-eight million, nine hundred ninety-one thousand, nine hundred ninety-nine".