49721 has 4 divisors (see below), whose sum is σ = 56832. Its totient is φ = 42612.

The previous prime is 49711. The next prime is 49727. The reversal of 49721 is 12794.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12794 = 2 ⋅6397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49721 is a prime.

It is a d-powerful number, because it can be written as 4³ + 9² + 7⁵ + 2¹⁵ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545 + ... + 3558.

It is an arithmetic number, because the mean of its divisors is an integer number (14208).

2⁴⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

49721 is a deficient number, since it is larger than the sum of its proper divisors (7111).

49721 is an equidigital number, since it uses as much as digits as its factorization.

49721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110.

The product of its digits is 504, while the sum is 23.

The square root of 49721 is about 222.9820620588. The cubic root of 49721 is about 36.7716641512.

The spelling of 49721 in words is "forty-nine thousand, seven hundred twenty-one".