9810561 has 4 divisors (see below), whose sum is σ = 13080752. Its totient is φ = 6540372.

The previous prime is 9810557. The next prime is 9810571. The reversal of 9810561 is 1650189.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 1650189 = 3 ⋅550063.

It is not a de Polignac number, because 9810561 - 2² = 9810557 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9810551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635091 + ... + 1635096.

It is an arithmetic number, because the mean of its divisors is an integer number (3270188).

Almost surely, 2^9810561 is an apocalyptic number.

It is an amenable number.

9810561 is a deficient number, since it is larger than the sum of its proper divisors (3270191).

9810561 is a wasteful number, since it uses less digits than its factorization.

9810561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270190.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 9810561 is about 3132.1815081505. The cubic root of 9810561 is about 214.0743402015.

The spelling of 9810561 in words is "nine million, eight hundred ten thousand, five hundred sixty-one".