8701921 has 2 divisors, whose sum is σ = 8701922. Its totient is φ = 8701920.

The previous prime is 8701907. The next prime is 8701933. The reversal of 8701921 is 1291078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5688225 + 3013696 = 2385^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 8701921 - 2⁹ = 8701409 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8701921.

It is not a weakly prime, because it can be changed into another prime (8701951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4350960 + 4350961.

It is an arithmetic number, because the mean of its divisors is an integer number (4350961).

Almost surely, 2^8701921 is an apocalyptic number.

It is an amenable number.

8701921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8701921 is an equidigital number, since it uses as much as digits as its factorization.

8701921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 8701921 is about 2949.9018627744. The cubic root of 8701921 is about 205.6861482082.

Adding to 8701921 its reverse (1291078), we get a palindrome (9992999).

The spelling of 8701921 in words is "eight million, seven hundred one thousand, nine hundred twenty-one".