9921061 has 4 divisors (see below), whose sum is σ = 10008972. Its totient is φ = 9833152.

The previous prime is 9921053. The next prime is 9921133. The reversal of 9921061 is 1601299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1601299 = 7 ⋅228757.

It can be written as a sum of positive squares in 2 ways, for example, as 2528100 + 7392961 = 1590^2 + 2719^2 .

It is a cyclic number.

It is not a de Polignac number, because 9921061 - 2³ = 9921053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921001) 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, 43786 + ... + 44011.

It is an arithmetic number, because the mean of its divisors is an integer number (2502243).

Almost surely, 2^9921061 is an apocalyptic number.

It is an amenable number.

9921061 is a deficient number, since it is larger than the sum of its proper divisors (87911).

9921061 is a wasteful number, since it uses less digits than its factorization.

9921061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87910.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 9921061 is about 3149.7715790197. The cubic root of 9921061 is about 214.8750743523.

The spelling of 9921061 in words is "nine million, nine hundred twenty-one thousand, sixty-one".