6550381 has 6 divisors (see below), whose sum is σ = 6617450. Its totient is φ = 6483936.

The previous prime is 6550367. The next prime is 6550403. The reversal of 6550381 is 1830556.

6550381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2102500 + 4447881 = 1450^2 + 2109^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6550381 is a prime.

It is a super-2 number, since 2×6550381² = 85814982490322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6550361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18595 + ... + 18943.

Almost surely, 2^6550381 is an apocalyptic number.

It is an amenable number.

6550381 is a deficient number, since it is larger than the sum of its proper divisors (67069).

6550381 is an equidigital number, since it uses as much as digits as its factorization.

6550381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 6550381 is about 2559.3712118409. The cubic root of 6550381 is about 187.1064908622.

The spelling of 6550381 in words is "six million, five hundred fifty thousand, three hundred eighty-one".