5981661 has 16 divisors (see below), whose sum is σ = 10128000. Its totient is φ = 3417984.

The previous prime is 5981659. The next prime is 5981663. The reversal of 5981661 is 1661895.

5981661 is a `hidden beast` number, since 598 + 1 + 6 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (5981659) and next prime (5981663).

It is not a de Polignac number, because 5981661 - 2¹ = 5981659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5981663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15636 + ... + 16013.

It is an arithmetic number, because the mean of its divisors is an integer number (633000).

Almost surely, 2^5981661 is an apocalyptic number.

It is an amenable number.

5981661 is a deficient number, since it is larger than the sum of its proper divisors (4146339).

5981661 is a wasteful number, since it uses less digits than its factorization.

5981661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31665 (or 31659 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 5981661 is about 2445.7434452534. The cubic root of 5981661 is about 181.5267360382.

The spelling of 5981661 in words is "five million, nine hundred eighty-one thousand, six hundred sixty-one".