4688921 has 2 divisors, whose sum is σ = 4688922. Its totient is φ = 4688920.

The previous prime is 4688909. The next prime is 4688927. The reversal of 4688921 is 1298864.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3200521 + 1488400 = 1789^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 4688921 - 2¹⁸ = 4426777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4688927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2344460 + 2344461.

It is an arithmetic number, because the mean of its divisors is an integer number (2344461).

Almost surely, 2^4688921 is an apocalyptic number.

It is an amenable number.

4688921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4688921 is an equidigital number, since it uses as much as digits as its factorization.

4688921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 4688921 is about 2165.3916504873. The cubic root of 4688921 is about 167.3751471759.

The spelling of 4688921 in words is "four million, six hundred eighty-eight thousand, nine hundred twenty-one".