9872641 has 2 divisors, whose sum is σ = 9872642. Its totient is φ = 9872640.

The previous prime is 9872623. The next prime is 9872657. The reversal of 9872641 is 1462789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5271616 + 4601025 = 2296^2 + 2145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9872641 is a prime.

9872641 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9872641.

It is not a weakly prime, because it can be changed into another prime (9872341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4936320 + 4936321.

It is an arithmetic number, because the mean of its divisors is an integer number (4936321).

Almost surely, 2^9872641 is an apocalyptic number.

It is an amenable number.

9872641 is a deficient number, since it is larger than the sum of its proper divisors (1).

9872641 is an equidigital number, since it uses as much as digits as its factorization.

9872641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 9872641 is about 3142.0759061487. The cubic root of 9872641 is about 214.5249362902.

The spelling of 9872641 in words is "nine million, eight hundred seventy-two thousand, six hundred forty-one".