68921111 has 16 divisors (see below), whose sum is σ = 84225024. Its totient is φ = 55050624.

The previous prime is 68921093. The next prime is 68921117. The reversal of 68921111 is 11112986.

It is a de Polignac number, because none of the positive numbers 2^k-68921111 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 (68921117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9446 + ... + 15068.

It is an arithmetic number, because the mean of its divisors is an integer number (5264064).

Almost surely, 2^68921111 is an apocalyptic number.

68921111 is a deficient number, since it is larger than the sum of its proper divisors (15303913).

68921111 is a wasteful number, since it uses less digits than its factorization.

68921111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5750.

The product of its digits is 864, while the sum is 29.

The square root of 68921111 is about 8301.8739450801. The cubic root of 68921111 is about 410.0002201070. Note that the first 3 decimals are identical.

The spelling of 68921111 in words is "sixty-eight million, nine hundred twenty-one thousand, one hundred eleven".