545533921 has 4 divisors (see below), whose sum is σ = 545911344. Its totient is φ = 545156500.

The previous prime is 545533913. The next prime is 545533931. The reversal of 545533921 is 129335545.

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 545533921 - 2³ = 545533913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545533931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186535 + ... + 189436.

It is an arithmetic number, because the mean of its divisors is an integer number (136477836).

Almost surely, 2^545533921 is an apocalyptic number.

It is an amenable number.

545533921 is a deficient number, since it is larger than the sum of its proper divisors (377423).

545533921 is a wasteful number, since it uses less digits than its factorization.

545533921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377422.

The product of its digits is 81000, while the sum is 37.

The square root of 545533921 is about 23356.6675919319. The cubic root of 545533921 is about 817.0975719774.

The spelling of 545533921 in words is "five hundred forty-five million, five hundred thirty-three thousand, nine hundred twenty-one".