539566121 has 4 divisors (see below), whose sum is σ = 539639892. Its totient is φ = 539492352.

The previous prime is 539566087. The next prime is 539566163. The reversal of 539566121 is 121665935.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121665935 = 5 ⋅24333187.

It can be written as a sum of positive squares in 2 ways, for example, as 386672896 + 152893225 = 19664^2 + 12365^2 .

It is a cyclic number.

It is not a de Polignac number, because 539566121 - 2²⁶ = 472457257 is a prime.

It is a super-2 number, since 2×539566121² = 582263197861973282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (539566171) 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, 24536 + ... + 41001.

It is an arithmetic number, because the mean of its divisors is an integer number (134909973).

Almost surely, 2^539566121 is an apocalyptic number.

It is an amenable number.

539566121 is a deficient number, since it is larger than the sum of its proper divisors (73771).

539566121 is an equidigital number, since it uses as much as digits as its factorization.

539566121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73770.

The product of its digits is 48600, while the sum is 38.

The square root of 539566121 is about 23228.5626115780. The cubic root of 539566121 is about 814.1071286138.

The spelling of 539566121 in words is "five hundred thirty-nine million, five hundred sixty-six thousand, one hundred twenty-one".