45505021 has 4 divisors (see below), whose sum is σ = 45522432. Its totient is φ = 45487612.

The previous prime is 45505013. The next prime is 45505069. The reversal of 45505021 is 12050554.

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 45505021 - 2³ = 45505013 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45504983 and 45505001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45505001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3901 + ... + 10306.

It is an arithmetic number, because the mean of its divisors is an integer number (11380608).

Almost surely, 2^45505021 is an apocalyptic number.

It is an amenable number.

45505021 is a deficient number, since it is larger than the sum of its proper divisors (17411).

45505021 is a wasteful number, since it uses less digits than its factorization.

45505021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17410.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 45505021 is about 6745.7409526308. The cubic root of 45505021 is about 357.0149805272.

Adding to 45505021 its reverse (12050554), we get a palindrome (57555575).

The spelling of 45505021 in words is "forty-five million, five hundred five thousand, twenty-one".