9174721 has 2 divisors, whose sum is σ = 9174722. Its totient is φ = 9174720.

The previous prime is 9174719. The next prime is 9174749. The reversal of 9174721 is 1274719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5013121 + 4161600 = 2239^2 + 2040^2 .

It is an emirp because it is prime and its reverse (1274719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9174721 - 2¹ = 9174719 is a prime.

Together with 9174719, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9174751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4587360 + 4587361.

It is an arithmetic number, because the mean of its divisors is an integer number (4587361).

Almost surely, 2^9174721 is an apocalyptic number.

It is an amenable number.

9174721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9174721 is an equidigital number, since it uses as much as digits as its factorization.

9174721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 31.

The square root of 9174721 is about 3028.9801914176. The cubic root of 9174721 is about 209.3458176006.

The spelling of 9174721 in words is "nine million, one hundred seventy-four thousand, seven hundred twenty-one".