49971 has 4 divisors (see below), whose sum is σ = 66632. Its totient is φ = 33312.

The previous prime is 49957. The next prime is 49991. The reversal of 49971 is 17994.

49971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 49971 - 2⁵ = 49939 is a prime.

It is a D-number.

It is a Duffinian number.

49971 is a lucky number.

It is a nialpdrome in base 16.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (49921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8326 + ... + 8331.

It is an arithmetic number, because the mean of its divisors is an integer number (16658).

2⁴⁹⁹⁷¹ is an apocalyptic number.

49971 is a deficient number, since it is larger than the sum of its proper divisors (16661).

49971 is a wasteful number, since it uses less digits than its factorization.

49971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16660.

The product of its digits is 2268, while the sum is 30.

The square root of 49971 is about 223.5419423732. The cubic root of 49971 is about 36.8331911481.

The spelling of 49971 in words is "forty-nine thousand, nine hundred seventy-one".