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8664421 is a prime number
BaseRepresentation
bin100001000011…
…010101100101
3121022012100111
4201003111211
54204230141
6505413021
7133434463
oct41032545
917265314
108664421
114988787
122a9a171
131a4499c
141217833
15b62381
hex843565

8664421 has 2 divisors, whose sum is σ = 8664422. Its totient is φ = 8664420.

The previous prime is 8664419. The next prime is 8664427. The reversal of 8664421 is 1244668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6812100 + 1852321 = 2610^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 8664421 - 21 = 8664419 is a prime.

Together with 8664419, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p581494 and since 8664421 and 581494 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8664427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4332210 + 4332211.

It is an arithmetic number, because the mean of its divisors is an integer number (4332211).

Almost surely, 28664421 is an apocalyptic number.

It is an amenable number.

8664421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8664421 is an equidigital number, since it uses as much as digits as its factorization.

8664421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 8664421 is about 2943.5388565467. The cubic root of 8664421 is about 205.3902619343.

The spelling of 8664421 in words is "eight million, six hundred sixty-four thousand, four hundred twenty-one".