6216381 has 12 divisors (see below), whose sum is σ = 9188608. Its totient is φ = 4047624.

The previous prime is 6216377. The next prime is 6216389. The reversal of 6216381 is 1836126.

6216381 is a `hidden beast` number, since 6 + 21 + 638 + 1 = 666.

It is not a de Polignac number, because 6216381 - 2² = 6216377 is a prime.

It is a super-2 number, since 2×6216381² = 77286785474322, which contains 22 as substring.

It is a Duffinian number.

6216381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6216389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7645 + ... + 8418.

Almost surely, 2^6216381 is an apocalyptic number.

It is an amenable number.

6216381 is a deficient number, since it is larger than the sum of its proper divisors (2972227).

6216381 is a wasteful number, since it uses less digits than its factorization.

6216381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16112 (or 16109 counting only the distinct ones).

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

The square root of 6216381 is about 2493.2671337023. The cubic root of 6216381 is about 183.8707050870.

The spelling of 6216381 in words is "six million, two hundred sixteen thousand, three hundred eighty-one".