9913021897 has 4 divisors (see below), whose sum is σ = 10100060100. Its totient is φ = 9725983696.

The previous prime is 9913021883. The next prime is 9913021927. The reversal of 9913021897 is 7981203199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4648648761 + 5264373136 = 68181^2 + 72556^2 .

It is a cyclic number.

It is not a de Polignac number, because 9913021897 - 2¹⁵ = 9912989129 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9913021897.

It is not an unprimeable number, because it can be changed into a prime (9913024897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93519022 + ... + 93519127.

It is an arithmetic number, because the mean of its divisors is an integer number (2525015025).

Almost surely, 2^9913021897 is an apocalyptic number.

It is an amenable number.

9913021897 is a deficient number, since it is larger than the sum of its proper divisors (187038203).

9913021897 is a wasteful number, since it uses less digits than its factorization.

9913021897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187038202.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 9913021897 is about 99564.1597011696. The cubic root of 9913021897 is about 2148.1702042577.

The spelling of 9913021897 in words is "nine billion, nine hundred thirteen million, twenty-one thousand, eight hundred ninety-seven".