6381261 has 10 divisors (see below), whose sum is σ = 9532622. Its totient is φ = 4254120.

The previous prime is 6381251. The next prime is 6381299. The reversal of 6381261 is 1621836.

6381261 is a `hidden beast` number, since 638 + 1 + 26 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4435236 + 1946025 = 2106^2 + 1395^2 .

It is not a de Polignac number, because 6381261 - 2⁹ = 6380749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39310 + ... + 39471.

Almost surely, 2^6381261 is an apocalyptic number.

It is an amenable number.

6381261 is a deficient number, since it is larger than the sum of its proper divisors (3151361).

6381261 is an equidigital number, since it uses as much as digits as its factorization.

6381261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78793 (or 78784 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 6381261 is about 2526.1157930705. The cubic root of 6381261 is about 185.4821705073.

The spelling of 6381261 in words is "six million, three hundred eighty-one thousand, two hundred sixty-one".