6605381 has 2 divisors, whose sum is σ = 6605382. Its totient is φ = 6605380.

The previous prime is 6605377. The next prime is 6605399. The reversal of 6605381 is 1835066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6584356 + 21025 = 2566^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 6605381 - 2² = 6605377 is a prime.

It is a super-2 number, since 2×6605381² = 87262116310322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6605311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3302690 + 3302691.

It is an arithmetic number, because the mean of its divisors is an integer number (3302691).

Almost surely, 2^6605381 is an apocalyptic number.

It is an amenable number.

6605381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6605381 is an equidigital number, since it uses as much as digits as its factorization.

6605381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 6605381 is about 2570.0935780629. The cubic root of 6605381 is about 187.6287092570.

The spelling of 6605381 in words is "six million, six hundred five thousand, three hundred eighty-one".