45681 has 4 divisors (see below), whose sum is σ = 60912. Its totient is φ = 30452.

The previous prime is 45677. The next prime is 45691. The reversal of 45681 is 18654.

45681 is nontrivially palindromic in base 9.

45681 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 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.

It is a cyclic number.

It is not a de Polignac number, because 45681 - 2² = 45677 is a prime.

It is a super-2 number, since 2×45681² = 4173507522, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

45681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (45631) 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, 7611 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (15228).

2⁴⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

45681 is a deficient number, since it is larger than the sum of its proper divisors (15231).

45681 is a wasteful number, since it uses less digits than its factorization.

45681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15230.

The product of its digits is 960, while the sum is 24.

The square root of 45681 is about 213.7311395188. The cubic root of 45681 is about 35.7474609832.

The spelling of 45681 in words is "forty-five thousand, six hundred eighty-one".