5918661 has 18 divisors (see below), whose sum is σ = 9945702. Its totient is φ = 3381840.

The previous prime is 5918657. The next prime is 5918681. The reversal of 5918661 is 1668195.

5918661 is a `hidden beast` number, since 591 + 8 + 6 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5832225 + 86436 = 2415^2 + 294^2 .

It is not a de Polignac number, because 5918661 - 2² = 5918657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5918681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6270 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (552539).

Almost surely, 2^5918661 is an apocalyptic number.

It is an amenable number.

5918661 is a deficient number, since it is larger than the sum of its proper divisors (4027041).

5918661 is a wasteful number, since it uses less digits than its factorization.

5918661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13441 (or 13431 counting only the distinct ones).

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

The square root of 5918661 is about 2432.8298337533. The cubic root of 5918661 is about 180.8871940382.

The spelling of 5918661 in words is "five million, nine hundred eighteen thousand, six hundred sixty-one".