545423521 has 4 divisors (see below), whose sum is σ = 545594544. Its totient is φ = 545252500.

The previous prime is 545423507. The next prime is 545423537. The reversal of 545423521 is 125324545.

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: 125324545 = 5 ⋅25064909.

It is a cyclic number.

It is not a de Polignac number, because 545423521 - 2⁹ = 545423009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545423551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80635 + ... + 87136.

It is an arithmetic number, because the mean of its divisors is an integer number (136398636).

Almost surely, 2^545423521 is an apocalyptic number.

It is an amenable number.

545423521 is a deficient number, since it is larger than the sum of its proper divisors (171023).

545423521 is a wasteful number, since it uses less digits than its factorization.

545423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171022.

The product of its digits is 24000, while the sum is 31.

The square root of 545423521 is about 23354.3041215105. The cubic root of 545423521 is about 817.0424494303.

The spelling of 545423521 in words is "five hundred forty-five million, four hundred twenty-three thousand, five hundred twenty-one".