10989521 has 4 divisors (see below), whose sum is σ = 11368500. Its totient is φ = 10610544.

The previous prime is 10989509. The next prime is 10989523. The reversal of 10989521 is 12598901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12598901 = 7 ⋅1799843.

It can be written as a sum of positive squares in 2 ways, for example, as 4558225 + 6431296 = 2135^2 + 2536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10989521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10989523) 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, 189446 + ... + 189503.

It is an arithmetic number, because the mean of its divisors is an integer number (2842125).

Almost surely, 2^10989521 is an apocalyptic number.

It is an amenable number.

10989521 is a deficient number, since it is larger than the sum of its proper divisors (378979).

10989521 is an equidigital number, since it uses as much as digits as its factorization.

10989521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378978.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 10989521 is about 3315.0446452499. The cubic root of 10989521 is about 222.3273651427.

The spelling of 10989521 in words is "ten million, nine hundred eighty-nine thousand, five hundred twenty-one".