8721101 has 2 divisors, whose sum is σ = 8721102. Its totient is φ = 8721100.

The previous prime is 8721079. The next prime is 8721121. The reversal of 8721101 is 1011278.

It is an a-pointer prime, because the next prime (8721121) can be obtained adding 8721101 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8128201 + 592900 = 2851^2 + 770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8721101 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8721121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360550 + 4360551.

It is an arithmetic number, because the mean of its divisors is an integer number (4360551).

Almost surely, 2^8721101 is an apocalyptic number.

It is an amenable number.

8721101 is a deficient number, since it is larger than the sum of its proper divisors (1).

8721101 is an equidigital number, since it uses as much as digits as its factorization.

8721101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 8721101 is about 2953.1510289858. The cubic root of 8721101 is about 205.8371556856.

Adding to 8721101 its reverse (1011278), we get a palindrome (9732379).

The spelling of 8721101 in words is "eight million, seven hundred twenty-one thousand, one hundred one".