9169921 has 2 divisors, whose sum is σ = 9169922. Its totient is φ = 9169920.

The previous prime is 9169889. The next prime is 9169933. The reversal of 9169921 is 1299619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8761600 + 408321 = 2960^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 9169921 - 2⁵ = 9169889 is a prime.

It is a super-2 number, since 2×9169921² = 168174902292482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9169021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4584960 + 4584961.

It is an arithmetic number, because the mean of its divisors is an integer number (4584961).

Almost surely, 2^9169921 is an apocalyptic number.

It is an amenable number.

9169921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9169921 is an equidigital number, since it uses as much as digits as its factorization.

9169921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 37.

The square root of 9169921 is about 3028.1877418681. The cubic root of 9169921 is about 209.3093029492.

The spelling of 9169921 in words is "nine million, one hundred sixty-nine thousand, nine hundred twenty-one".