68311111 has 4 divisors (see below), whose sum is σ = 74521224. Its totient is φ = 62101000.

The previous prime is 68311109. The next prime is 68311121. The reversal of 68311111 is 11111386.

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 68311111 - 2¹ = 68311109 is a prime.

It is a Duffinian number.

68311111 is a modest number, since divided by 11111 gives 683 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68311121) 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, 3105040 + ... + 3105061.

It is an arithmetic number, because the mean of its divisors is an integer number (18630306).

Almost surely, 2^68311111 is an apocalyptic number.

68311111 is a deficient number, since it is larger than the sum of its proper divisors (6210113).

68311111 is a wasteful number, since it uses less digits than its factorization.

68311111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210112.

The product of its digits is 144, while the sum is 22.

The square root of 68311111 is about 8265.0535993422. The cubic root of 68311111 is about 408.7870377022.

Adding to 68311111 its reverse (11111386), we get a palindrome (79422497).

The spelling of 68311111 in words is "sixty-eight million, three hundred eleven thousand, one hundred eleven".