539163821 has 4 divisors (see below), whose sum is σ = 616187232. Its totient is φ = 462140412.

The previous prime is 539163803. The next prime is 539163839. The reversal of 539163821 is 128361935.

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 an interprime number because it is at equal distance from previous prime (539163803) and next prime (539163839).

It is a cyclic number.

It is not a de Polignac number, because 539163821 - 2¹⁰ = 539162797 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 (539163851) 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, 38511695 + ... + 38511708.

It is an arithmetic number, because the mean of its divisors is an integer number (154046808).

Almost surely, 2^539163821 is an apocalyptic number.

It is an amenable number.

539163821 is a deficient number, since it is larger than the sum of its proper divisors (77023411).

539163821 is an equidigital number, since it uses as much as digits as its factorization.

539163821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77023410.

The product of its digits is 38880, while the sum is 38.

The square root of 539163821 is about 23219.9013994461. The cubic root of 539163821 is about 813.9047457997.

The spelling of 539163821 in words is "five hundred thirty-nine million, one hundred sixty-three thousand, eight hundred twenty-one".