48991 has 2 divisors, whose sum is σ = 48992. Its totient is φ = 48990.

The previous prime is 48989. The next prime is 49003. The reversal of 48991 is 19984.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 48991 - 2¹ = 48989 is a prime.

Together with 48989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (48091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24495 + 24496.

It is an arithmetic number, because the mean of its divisors is an integer number (24496).

2⁴⁸⁹⁹¹ is an apocalyptic number.

48991 is a deficient number, since it is larger than the sum of its proper divisors (1).

48991 is an equidigital number, since it uses as much as digits as its factorization.

48991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 48991 is about 221.3391063504. The cubic root of 48991 is about 36.5908165718.

It can be divided in two parts, 4899 and 1, that added together give a square (4900 = 70²).

The spelling of 48991 in words is "forty-eight thousand, nine hundred ninety-one".