68121671 has 4 divisors (see below), whose sum is σ = 68139000. Its totient is φ = 68104344.

The previous prime is 68121649. The next prime is 68121679. The reversal of 68121671 is 17612186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17612186 = 2 ⋅8806093.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68121671 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 (68121679) 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, 380 + ... + 11678.

It is an arithmetic number, because the mean of its divisors is an integer number (17034750).

Almost surely, 2^68121671 is an apocalyptic number.

68121671 is a deficient number, since it is larger than the sum of its proper divisors (17329).

68121671 is a wasteful number, since it uses less digits than its factorization.

68121671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17328.

The product of its digits is 4032, while the sum is 32.

The square root of 68121671 is about 8253.5853421407. The cubic root of 68121671 is about 408.4088058561.

The spelling of 68121671 in words is "sixty-eight million, one hundred twenty-one thousand, six hundred seventy-one".