68206513 has 4 divisors (see below), whose sum is σ = 68223088. Its totient is φ = 68189940.

The previous prime is 68206511. The next prime is 68206517. The reversal of 68206513 is 31560286.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68206513 - 2¹ = 68206511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68206511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3118 + ... + 12088.

It is an arithmetic number, because the mean of its divisors is an integer number (17055772).

Almost surely, 2^68206513 is an apocalyptic number.

It is an amenable number.

68206513 is a deficient number, since it is larger than the sum of its proper divisors (16575).

68206513 is an equidigital number, since it uses as much as digits as its factorization.

68206513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16574.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 68206513 is about 8258.7234485724. The cubic root of 68206513 is about 408.5782861616.

Adding to 68206513 its reverse (31560286), we get a palindrome (99766799).

The spelling of 68206513 in words is "sixty-eight million, two hundred six thousand, five hundred thirteen".