68196913 has 4 divisors (see below), whose sum is σ = 68213860. Its totient is φ = 68179968.

The previous prime is 68196907. The next prime is 68196941. The reversal of 68196913 is 31969186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31969186 = 2 ⋅15984593.

It can be written as a sum of positive squares in 2 ways, for example, as 38787984 + 29408929 = 6228^2 + 5423^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68196913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68196913.

It is not an unprimeable number, because it can be changed into a prime (68196943) 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, 1393 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (17053465).

Almost surely, 2^68196913 is an apocalyptic number.

It is an amenable number.

68196913 is a deficient number, since it is larger than the sum of its proper divisors (16947).

68196913 is a wasteful number, since it uses less digits than its factorization.

68196913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16946.

The product of its digits is 69984, while the sum is 43.

The square root of 68196913 is about 8258.1422244958. The cubic root of 68196913 is about 408.5591162641.

The spelling of 68196913 in words is "sixty-eight million, one hundred ninety-six thousand, nine hundred thirteen".