6466921 has 2 divisors, whose sum is σ = 6466922. Its totient is φ = 6466920.

The previous prime is 6466883. The next prime is 6466937. The reversal of 6466921 is 1296646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5456896 + 1010025 = 2336^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 6466921 - 2¹¹ = 6464873 is a prime.

It is not a weakly prime, because it can be changed into another prime (6466951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233460 + 3233461.

It is an arithmetic number, because the mean of its divisors is an integer number (3233461).

Almost surely, 2^6466921 is an apocalyptic number.

It is an amenable number.

6466921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6466921 is an equidigital number, since it uses as much as digits as its factorization.

6466921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 6466921 is about 2543.0141564687. The cubic root of 6466921 is about 186.3084353374.

The spelling of 6466921 in words is "six million, four hundred sixty-six thousand, nine hundred twenty-one".