9881657 has 4 divisors (see below), whose sum is σ = 9892980. Its totient is φ = 9870336.

The previous prime is 9881647. The next prime is 9881671. The reversal of 9881657 is 7561889.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7561889 = 17 ⋅444817.

It can be written as a sum of positive squares in 2 ways, for example, as 2019241 + 7862416 = 1421^2 + 2804^2 .

It is a cyclic number.

It is not a de Polignac number, because 9881657 - 2⁶ = 9881593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9881647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4232 + ... + 6137.

It is an arithmetic number, because the mean of its divisors is an integer number (2473245).

Almost surely, 2^9881657 is an apocalyptic number.

It is an amenable number.

9881657 is a deficient number, since it is larger than the sum of its proper divisors (11323).

9881657 is a wasteful number, since it uses less digits than its factorization.

9881657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11322.

The product of its digits is 120960, while the sum is 44.

The square root of 9881657 is about 3143.5102990129. The cubic root of 9881657 is about 214.5902200155.

The spelling of 9881657 in words is "nine million, eight hundred eighty-one thousand, six hundred fifty-seven".