545502021 has 4 divisors (see below), whose sum is σ = 727336032. Its totient is φ = 363668012.

The previous prime is 545502019. The next prime is 545502049. The reversal of 545502021 is 120205545.

It is a happy number.

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 545502021 - 2¹ = 545502019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 545501982 and 545502000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545502011) 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, 90917001 + ... + 90917006.

It is an arithmetic number, because the mean of its divisors is an integer number (181834008).

Almost surely, 2^545502021 is an apocalyptic number.

It is an amenable number.

545502021 is a deficient number, since it is larger than the sum of its proper divisors (181834011).

545502021 is a wasteful number, since it uses less digits than its factorization.

545502021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181834010.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 545502021 is about 23355.9846934356. The cubic root of 545502021 is about 817.0816451214.

Adding to 545502021 its reverse (120205545), we get a palindrome (665707566).

The spelling of 545502021 in words is "five hundred forty-five million, five hundred two thousand, twenty-one".