68106391 has 4 divisors (see below), whose sum is σ = 68123952. Its totient is φ = 68088832.

The previous prime is 68106383. The next prime is 68106461. The reversal of 68106391 is 19360186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68106391 - 2³ = 68106383 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 (68106331) 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, 106 + ... + 11671.

It is an arithmetic number, because the mean of its divisors is an integer number (17030988).

Almost surely, 2^68106391 is an apocalyptic number.

68106391 is a deficient number, since it is larger than the sum of its proper divisors (17561).

68106391 is a wasteful number, since it uses less digits than its factorization.

68106391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17560.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 68106391 is about 8252.6596319005. The cubic root of 68106391 is about 408.3782675897.

The spelling of 68106391 in words is "sixty-eight million, one hundred six thousand, three hundred ninety-one".