6631861 has 12 divisors (see below), whose sum is σ = 7022496. Its totient is φ = 6260760.

The previous prime is 6631789. The next prime is 6631871. The reversal of 6631861 is 1681366.

It is not a de Polignac number, because 6631861 - 2⁷ = 6631733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6631871) 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, 64336 + ... + 64438.

It is an arithmetic number, because the mean of its divisors is an integer number (585208).

Almost surely, 2^6631861 is an apocalyptic number.

It is an amenable number.

6631861 is a deficient number, since it is larger than the sum of its proper divisors (390635).

6631861 is a wasteful number, since it uses less digits than its factorization.

6631861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 201 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 6631861 is about 2575.2399888166. The cubic root of 6631861 is about 187.8791002520.

The spelling of 6631861 in words is "six million, six hundred thirty-one thousand, eight hundred sixty-one".