6601381 has 2 divisors, whose sum is σ = 6601382. Its totient is φ = 6601380.

The previous prime is 6601363. The next prime is 6601393. The reversal of 6601381 is 1831066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6548481 + 52900 = 2559^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601381 - 2⁵ = 6601349 is a prime.

It is a super-2 number, since 2×6601381² = 87156462214322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6601081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300690 + 3300691.

It is an arithmetic number, because the mean of its divisors is an integer number (3300691).

Almost surely, 2^6601381 is an apocalyptic number.

It is an amenable number.

6601381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601381 is an equidigital number, since it uses as much as digits as its factorization.

6601381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 6601381 is about 2569.3152784351. The cubic root of 6601381 is about 187.5908276984.

The spelling of 6601381 in words is "six million, six hundred one thousand, three hundred eighty-one".