49581 has 12 divisors (see below), whose sum is σ = 81952. Its totient is φ = 28296.

The previous prime is 49559. The next prime is 49597. The reversal of 49581 is 18594.

49581 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 49581 - 2⁵ = 49549 is a prime.

It is a super-2 number, since 2×49581² = 4916551122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331 + ... + 456.

2⁴⁹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

49581 is a deficient number, since it is larger than the sum of its proper divisors (32371).

49581 is a wasteful number, since it uses less digits than its factorization.

49581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 797 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 49581 is about 222.6679141682. The cubic root of 49581 is about 36.7371189064.

It can be divided in two parts, 495 and 81, that added together give a square (576 = 24²).

The spelling of 49581 in words is "forty-nine thousand, five hundred eighty-one".