541331221 has 4 divisors (see below), whose sum is σ = 573174252. Its totient is φ = 509488192.

The previous prime is 541331209. The next prime is 541331227. The reversal of 541331221 is 122133145.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122133145 = 5 ⋅24426629.

It can be written as a sum of positive squares in 2 ways, for example, as 285779025 + 255552196 = 16905^2 + 15986^2 .

It is a cyclic number.

It is not a de Polignac number, because 541331221 - 2⁹ = 541330709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 541331192 and 541331201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (541331227) 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, 15921490 + ... + 15921523.

It is an arithmetic number, because the mean of its divisors is an integer number (143293563).

Almost surely, 2^541331221 is an apocalyptic number.

It is an amenable number.

541331221 is a deficient number, since it is larger than the sum of its proper divisors (31843031).

541331221 is a wasteful number, since it uses less digits than its factorization.

541331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31843030.

The product of its digits is 720, while the sum is 22.

The square root of 541331221 is about 23266.5257612734. The cubic root of 541331221 is about 814.9939006155.

Adding to 541331221 its reverse (122133145), we get a palindrome (663464366).

The spelling of 541331221 in words is "five hundred forty-one million, three hundred thirty-one thousand, two hundred twenty-one".