6291661 has 4 divisors (see below), whose sum is σ = 6300000. Its totient is φ = 6283324.

The previous prime is 6291653. The next prime is 6291689. The reversal of 6291661 is 1661926.

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 6291661 - 2³ = 6291653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6291611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2911 + ... + 4588.

It is an arithmetic number, because the mean of its divisors is an integer number (1575000).

Almost surely, 2^6291661 is an apocalyptic number.

It is an amenable number.

6291661 is a deficient number, since it is larger than the sum of its proper divisors (8339).

6291661 is an equidigital number, since it uses as much as digits as its factorization.

6291661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8338.

The product of its digits is 3888, while the sum is 31.

The square root of 6291661 is about 2508.3183609741. The cubic root of 6291661 is about 184.6099500582.

The spelling of 6291661 in words is "six million, two hundred ninety-one thousand, six hundred sixty-one".