9981697 has 4 divisors (see below), whose sum is σ = 10889136. Its totient is φ = 9074260.

The previous prime is 9981691. The next prime is 9981731. The reversal of 9981697 is 7961899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9981697 - 2³ = 9981689 is a prime.

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 9981697.

It is not an unprimeable number, because it can be changed into a prime (9981691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453703 + ... + 453724.

It is an arithmetic number, because the mean of its divisors is an integer number (2722284).

Almost surely, 2^9981697 is an apocalyptic number.

It is an amenable number.

9981697 is a deficient number, since it is larger than the sum of its proper divisors (907439).

9981697 is a wasteful number, since it uses less digits than its factorization.

9981697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907438.

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

The square root of 9981697 is about 3159.3823763514. The cubic root of 9981697 is about 215.3119466683.

It can be divided in two parts, 99 and 81697, that added together give a square (81796 = 286²).

The spelling of 9981697 in words is "nine million, nine hundred eighty-one thousand, six hundred ninety-seven".