45271809 has 24 divisors (see below), whose sum is σ = 71570304. Its totient is φ = 27348000.

The previous prime is 45271781. The next prime is 45271823. The reversal of 45271809 is 90817254.

It is not a de Polignac number, because 45271809 - 2⁸ = 45271553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (45271829) 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 23 ways as a sum of consecutive naturals, for example, 42139 + ... + 43199.

It is an arithmetic number, because the mean of its divisors is an integer number (2982096).

Almost surely, 2^45271809 is an apocalyptic number.

It is an amenable number.

45271809 is a deficient number, since it is larger than the sum of its proper divisors (26298495).

45271809 is a wasteful number, since it uses less digits than its factorization.

45271809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 45271809 is about 6728.4328784643. The cubic root of 45271809 is about 356.4040382799.

It can be divided in two parts, 4527 and 1809, that added together give a palindrome (6336).

The spelling of 45271809 in words is "forty-five million, two hundred seventy-one thousand, eight hundred nine".