8720101 has 4 divisors (see below), whose sum is σ = 9390892. Its totient is φ = 8049312.

The previous prime is 8720087. The next prime is 8720111. The reversal of 8720101 is 1010278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1010278 = 2 ⋅505139.

It can be written as a sum of positive squares in 2 ways, for example, as 5997601 + 2722500 = 2449^2 + 1650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8720101 is a prime.

It is a super-2 number, since 2×8720101² = 152080322900402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720111) 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 in 3 ways as a sum of consecutive naturals, for example, 335376 + ... + 335401.

It is an arithmetic number, because the mean of its divisors is an integer number (2347723).

Almost surely, 2^8720101 is an apocalyptic number.

It is an amenable number.

8720101 is a deficient number, since it is larger than the sum of its proper divisors (670791).

8720101 is a wasteful number, since it uses less digits than its factorization.

8720101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670790.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 8720101 is about 2952.9817134551. The cubic root of 8720101 is about 205.8292879855.

Adding to 8720101 its reverse (1010278), we get a palindrome (9730379).

The spelling of 8720101 in words is "eight million, seven hundred twenty thousand, one hundred one".