45919 has 4 divisors (see below), whose sum is σ = 46944. Its totient is φ = 44896.

The previous prime is 45893. The next prime is 45943. The reversal of 45919 is 91954.

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

It is a cyclic number.

It is not a de Polignac number, because 45919 - 2⁵ = 45887 is a prime.

It is a super-2 number, since 2×45919² = 4217109122, which contains 22 as substring.

It is a Duffinian number.

45919 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442 + ... + 535.

It is an arithmetic number, because the mean of its divisors is an integer number (11736).

2⁴⁵⁹¹⁹ is an apocalyptic number.

45919 is a deficient number, since it is larger than the sum of its proper divisors (1025).

45919 is an equidigital number, since it uses as much as digits as its factorization.

45919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its digits is 1620, while the sum is 28.

The square root of 45919 is about 214.2871904711. The cubic root of 45919 is about 35.8094354207.

The spelling of 45919 in words is "forty-five thousand, nine hundred nineteen".