45191819 has 6 divisors (see below), whose sum is σ = 45538740. Its totient is φ = 44847516.

The previous prime is 45191801. The next prime is 45191821. The reversal of 45191819 is 91819154.

It is not a de Polignac number, because 45191819 - 2²⁰ = 44143243 is a prime.

It is a super-2 number, since 2×45191819² = 4084601009057522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45191869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18152 + ... + 20490.

It is an arithmetic number, because the mean of its divisors is an integer number (7589790).

Almost surely, 2^45191819 is an apocalyptic number.

45191819 is a deficient number, since it is larger than the sum of its proper divisors (346921).

45191819 is an equidigital number, since it uses as much as digits as its factorization.

45191819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617 (or 2478 counting only the distinct ones).

The product of its digits is 12960, while the sum is 38.

The square root of 45191819 is about 6722.4860728751. The cubic root of 45191819 is about 356.1940064249.

The spelling of 45191819 in words is "forty-five million, one hundred ninety-one thousand, eight hundred nineteen".