6868921 has 2 divisors, whose sum is σ = 6868922. Its totient is φ = 6868920.

The previous prime is 6868913. The next prime is 6868987. The reversal of 6868921 is 1298686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6656400 + 212521 = 2580^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 6868921 - 2³ = 6868913 is a prime.

It is a Chen prime.

6868921 is a lucky number.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (6868991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3434460 + 3434461.

It is an arithmetic number, because the mean of its divisors is an integer number (3434461).

Almost surely, 2^6868921 is an apocalyptic number.

It is an amenable number.

6868921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6868921 is an equidigital number, since it uses as much as digits as its factorization.

6868921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 6868921 is about 2620.8626442452. The cubic root of 6868921 is about 190.0915625164.

The spelling of 6868921 in words is "six million, eight hundred sixty-eight thousand, nine hundred twenty-one".