539117221 has 4 divisors (see below), whose sum is σ = 557707500. Its totient is φ = 520526944.

The previous prime is 539117203. The next prime is 539117231. The reversal of 539117221 is 122711935.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 446688225 + 92428996 = 21135^2 + 9614^2 .

It is a cyclic number.

It is not a de Polignac number, because 539117221 - 2¹⁵ = 539084453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (539117231) 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, 9295096 + ... + 9295153.

It is an arithmetic number, because the mean of its divisors is an integer number (139426875).

Almost surely, 2^539117221 is an apocalyptic number.

It is an amenable number.

539117221 is a deficient number, since it is larger than the sum of its proper divisors (18590279).

539117221 is a wasteful number, since it uses less digits than its factorization.

539117221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18590278.

The product of its digits is 3780, while the sum is 31.

The square root of 539117221 is about 23218.8979281963. The cubic root of 539117221 is about 813.8812964927.

The spelling of 539117221 in words is "five hundred thirty-nine million, one hundred seventeen thousand, two hundred twenty-one".