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49991 is a prime number
BaseRepresentation
bin1100001101000111
32112120112
430031013
53044431
61023235
7265514
oct141507
975515
1049991
1134617
1224b1b
13199a6
141430b
15ec2b
hexc347

49991 has 2 divisors, whose sum is σ = 49992. Its totient is φ = 49990.

The previous prime is 49957. The next prime is 49993. The reversal of 49991 is 19994.

49991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 49991 - 26 = 49927 is a prime.

Together with 49993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 49991.

It is not a weakly prime, because it can be changed into another prime (49993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24995 + 24996.

It is an arithmetic number, because the mean of its divisors is an integer number (24996).

249991 is an apocalyptic number.

49991 is a deficient number, since it is larger than the sum of its proper divisors (1).

49991 is an equidigital number, since it uses as much as digits as its factorization.

49991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 49991 is about 223.5866722325. The cubic root of 49991 is about 36.8381044349.

The spelling of 49991 in words is "forty-nine thousand, nine hundred ninety-one".