8919121 has 2 divisors, whose sum is σ = 8919122. Its totient is φ = 8919120.

The previous prime is 8919077. The next prime is 8919133. The reversal of 8919121 is 1219198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5588496 + 3330625 = 2364^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 8919121 - 2¹³ = 8910929 is a prime.

8919121 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8919161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4459560 + 4459561.

It is an arithmetic number, because the mean of its divisors is an integer number (4459561).

Almost surely, 2^8919121 is an apocalyptic number.

It is an amenable number.

8919121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8919121 is an equidigital number, since it uses as much as digits as its factorization.

8919121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 31.

The square root of 8919121 is about 2986.4897455039. The cubic root of 8919121 is about 207.3834134828.

The spelling of 8919121 in words is "eight million, nine hundred nineteen thousand, one hundred twenty-one".