9825661 has 2 divisors, whose sum is σ = 9825662. Its totient is φ = 9825660.

The previous prime is 9825659. The next prime is 9825671. The reversal of 9825661 is 1665289.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9803161 + 22500 = 3131^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 9825661 - 2¹ = 9825659 is a prime.

It is a super-2 number, since 2×9825661² = 193087228173842, which contains 22 as substring.

Together with 9825659, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9825661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9825611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4912830 + 4912831.

It is an arithmetic number, because the mean of its divisors is an integer number (4912831).

Almost surely, 2^9825661 is an apocalyptic number.

It is an amenable number.

9825661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9825661 is an equidigital number, since it uses as much as digits as its factorization.

9825661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 9825661 is about 3134.5910419064. The cubic root of 9825661 is about 214.1841152864.

The spelling of 9825661 in words is "nine million, eight hundred twenty-five thousand, six hundred sixty-one".