168539513 has 4 divisors (see below), whose sum is σ = 178453620. Its totient is φ = 158625408.

The previous prime is 168539473. The next prime is 168539521. The reversal of 168539513 is 315935861.

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 102475129 + 66064384 = 10123^2 + 8128^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168539513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168539593) 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, 4957028 + ... + 4957061.

It is an arithmetic number, because the mean of its divisors is an integer number (44613405).

Almost surely, 2^168539513 is an apocalyptic number.

It is an amenable number.

168539513 is a deficient number, since it is larger than the sum of its proper divisors (9914107).

168539513 is an equidigital number, since it uses as much as digits as its factorization.

168539513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9914106.

The product of its digits is 97200, while the sum is 41.

The square root of 168539513 is about 12982.2768804243. The cubic root of 168539513 is about 552.3748689822.

The spelling of 168539513 in words is "one hundred sixty-eight million, five hundred thirty-nine thousand, five hundred thirteen".