545542221 has 16 divisors (see below), whose sum is σ = 867446784. Its totient is φ = 298184304.

The previous prime is 545542219. The next prime is 545542237. The reversal of 545542221 is 122245545.

It is not a de Polignac number, because 545542221 - 2¹ = 545542219 is a prime.

It is a super-2 number, since 2×545542221² = 595232629787225682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545542021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564261 + ... + 565226.

It is an arithmetic number, because the mean of its divisors is an integer number (54215424).

Almost surely, 2^545542221 is an apocalyptic number.

It is an amenable number.

545542221 is a deficient number, since it is larger than the sum of its proper divisors (321904563).

545542221 is a wasteful number, since it uses less digits than its factorization.

545542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129520.

The product of its digits is 16000, while the sum is 30.

The square root of 545542221 is about 23356.8452707124. The cubic root of 545542221 is about 817.1017158538.

Adding to 545542221 its reverse (122245545), we get a palindrome (667787766).

The spelling of 545542221 in words is "five hundred forty-five million, five hundred forty-two thousand, two hundred twenty-one".