49981 has 4 divisors (see below), whose sum is σ = 50464. Its totient is φ = 49500.

The previous prime is 49957. The next prime is 49991. The reversal of 49981 is 18994.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18994 = 2 ⋅9497.

It is a cyclic number.

It is not a de Polignac number, because 49981 - 2⁷ = 49853 is a prime.

It is a super-2 number, since 2×49981² = 4996200722, which contains 22 as substring.

It is a Duffinian number.

49981 is a lucky number.

It is a plaindrome in base 13.

It is a nialpdrome in base 15.

It is a congruent number.

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, 15 + ... + 316.

It is an arithmetic number, because the mean of its divisors is an integer number (12616).

It is a Poulet number, since it divides 2⁴⁹⁹⁸⁰-1.

2⁴⁹⁹⁸¹ is an apocalyptic number.

49981 is the 120-th centered heptagonal number.

It is an amenable number.

49981 is a deficient number, since it is larger than the sum of its proper divisors (483).

49981 is a wasteful number, since it uses less digits than its factorization.

49981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482.

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

The square root of 49981 is about 223.5643084215. The cubic root of 49981 is about 36.8356479553.

The spelling of 49981 in words is "forty-nine thousand, nine hundred eighty-one".