45811 has 4 divisors (see below), whose sum is σ = 46624. Its totient is φ = 45000.

The previous prime is 45779. The next prime is 45817. The reversal of 45811 is 11854.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11854 = 2 ⋅5927.

It is a 4-Lehmer number, since φ(45811) divides (45811-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 45811 - 2⁵ = 45779 is a prime.

It is a Duffinian number.

45811 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (45817) 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, 315 + ... + 436.

It is an arithmetic number, because the mean of its divisors is an integer number (11656).

2⁴⁵⁸¹¹ is an apocalyptic number.

45811 is a deficient number, since it is larger than the sum of its proper divisors (813).

45811 is an equidigital number, since it uses as much as digits as its factorization.

45811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812.

The product of its digits is 160, while the sum is 19.

The square root of 45811 is about 214.0350438596. The cubic root of 45811 is about 35.7813391714.

The spelling of 45811 in words is "forty-five thousand, eight hundred eleven".