6381556 has 6 divisors (see below), whose sum is σ = 11167730. Its totient is φ = 3190776.

The previous prime is 6381547. The next prime is 6381559. The reversal of 6381556 is 6551836.

It can be written as a sum of positive squares in only one way, i.e., 4691556 + 1690000 = 2166^2 + 1300^2 .

It is a super-2 number, since 2×6381556² = 81448513962272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 797691 + ... + 797698.

Almost surely, 2^6381556 is an apocalyptic number.

It is an amenable number.

6381556 is a deficient number, since it is larger than the sum of its proper divisors (4786174).

6381556 is a wasteful number, since it uses less digits than its factorization.

6381556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595393 (or 1595391 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 6381556 is about 2526.1741824348. The cubic root of 6381556 is about 185.4850286883.

The spelling of 6381556 in words is "six million, three hundred eighty-one thousand, five hundred fifty-six".