6331681 has 4 divisors (see below), whose sum is σ = 6340864. Its totient is φ = 6322500.

The previous prime is 6331679. The next prime is 6331691. The reversal of 6331681 is 1861336.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6331681 - 2¹ = 6331679 is a prime.

It is a super-2 number, since 2×6331681² = 80180368571522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6331691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3465 + ... + 4966.

It is an arithmetic number, because the mean of its divisors is an integer number (1585216).

Almost surely, 2^6331681 is an apocalyptic number.

It is an amenable number.

6331681 is a deficient number, since it is larger than the sum of its proper divisors (9183).

6331681 is an equidigital number, since it uses as much as digits as its factorization.

6331681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9182.

The product of its digits is 2592, while the sum is 28.

The square root of 6331681 is about 2516.2831716641. The cubic root of 6331681 is about 185.0005454087. Note that the first 3 decimals are identical.

The spelling of 6331681 in words is "six million, three hundred thirty-one thousand, six hundred eighty-one".