45169921 has 4 divisors (see below), whose sum is σ = 45191344. Its totient is φ = 45148500.

The previous prime is 45169919. The next prime is 45169931. The reversal of 45169921 is 12996154.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12996154 = 2 ⋅6498077.

It is a cyclic number.

It is not a de Polignac number, because 45169921 - 2¹ = 45169919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45169931) 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, 7155 + ... + 11896.

It is an arithmetic number, because the mean of its divisors is an integer number (11297836).

Almost surely, 2^45169921 is an apocalyptic number.

It is an amenable number.

45169921 is a deficient number, since it is larger than the sum of its proper divisors (21423).

45169921 is a wasteful number, since it uses less digits than its factorization.

45169921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21422.

The product of its digits is 19440, while the sum is 37.

The square root of 45169921 is about 6720.8571625947. The cubic root of 45169921 is about 356.1364650623.

The spelling of 45169921 in words is "forty-five million, one hundred sixty-nine thousand, nine hundred twenty-one".