9858661 has 4 divisors (see below), whose sum is σ = 9865024. Its totient is φ = 9852300.

The previous prime is 9858631. The next prime is 9858677. The reversal of 9858661 is 1668589.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9858661 - 2⁷ = 9858533 is a prime.

It is a super-3 number, since 3×9858661³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

9858661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9858631) 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 3 ways as a sum of consecutive naturals, for example, 826 + ... + 4516.

It is an arithmetic number, because the mean of its divisors is an integer number (2466256).

Almost surely, 2^9858661 is an apocalyptic number.

It is an amenable number.

9858661 is a deficient number, since it is larger than the sum of its proper divisors (6363).

9858661 is a wasteful number, since it uses less digits than its factorization.

9858661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6362.

The product of its digits is 103680, while the sum is 43.

The square root of 9858661 is about 3139.8504741468. The cubic root of 9858661 is about 214.4236302225.

The spelling of 9858661 in words is "nine million, eight hundred fifty-eight thousand, six hundred sixty-one".