9172861 has 2 divisors, whose sum is σ = 9172862. Its totient is φ = 9172860.

The previous prime is 9172841. The next prime is 9172873. The reversal of 9172861 is 1682719.

It is a happy number.

9172861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7562500 + 1610361 = 2750^2 + 1269^2 .

It is a cyclic number.

It is not a de Polignac number, because 9172861 - 2⁹ = 9172349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9172811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4586430 + 4586431.

It is an arithmetic number, because the mean of its divisors is an integer number (4586431).

Almost surely, 2^9172861 is an apocalyptic number.

It is an amenable number.

9172861 is a deficient number, since it is larger than the sum of its proper divisors (1).

9172861 is an equidigital number, since it uses as much as digits as its factorization.

9172861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 9172861 is about 3028.6731418230. The cubic root of 9172861 is about 209.3316696849.

The spelling of 9172861 in words is "nine million, one hundred seventy-two thousand, eight hundred sixty-one".