9872791 has 2 divisors, whose sum is σ = 9872792. Its totient is φ = 9872790.

The previous prime is 9872749. The next prime is 9872809. The reversal of 9872791 is 1972789.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9872791 - 2¹³ = 9864599 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9872711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4936395 + 4936396.

It is an arithmetic number, because the mean of its divisors is an integer number (4936396).

Almost surely, 2^9872791 is an apocalyptic number.

9872791 is a deficient number, since it is larger than the sum of its proper divisors (1).

9872791 is an equidigital number, since it uses as much as digits as its factorization.

9872791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 9872791 is about 3142.0997756278. The cubic root of 9872791 is about 214.5260227465.

The spelling of 9872791 in words is "nine million, eight hundred seventy-two thousand, seven hundred ninety-one".