49681 has 2 divisors, whose sum is σ = 49682. Its totient is φ = 49680.

The previous prime is 49669. The next prime is 49697. The reversal of 49681 is 18694.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46656 + 3025 = 216^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 49681 - 2⁹ = 49169 is a prime.

It is a super-2 number, since 2×49681² = 4936403522, which contains 22 as substring.

It is a Chen prime.

49681 is a lucky number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24840 + 24841.

It is an arithmetic number, because the mean of its divisors is an integer number (24841).

2⁴⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

49681 is a deficient number, since it is larger than the sum of its proper divisors (1).

49681 is an equidigital number, since it uses as much as digits as its factorization.

49681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 49681 is about 222.8923506987. The cubic root of 49681 is about 36.7618007053.

The spelling of 49681 in words is "forty-nine thousand, six hundred eighty-one".