6928921 has 2 divisors, whose sum is σ = 6928922. Its totient is φ = 6928920.

The previous prime is 6928897. The next prime is 6928949. The reversal of 6928921 is 1298296.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6760000 + 168921 = 2600^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 6928921 - 2⁷ = 6928793 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6928951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3464460 + 3464461.

It is an arithmetic number, because the mean of its divisors is an integer number (3464461).

Almost surely, 2^6928921 is an apocalyptic number.

It is an amenable number.

6928921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6928921 is an equidigital number, since it uses as much as digits as its factorization.

6928921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 6928921 is about 2632.2843691364. The cubic root of 6928921 is about 190.6434417704.

The spelling of 6928921 in words is "six million, nine hundred twenty-eight thousand, nine hundred twenty-one".