9981897 has 16 divisors (see below), whose sum is σ = 14391360. Its totient is φ = 6132672.

The previous prime is 9981889. The next prime is 9981899. The reversal of 9981897 is 7981899.

9981897 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9981897 - 2³ = 9981889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9981899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258 + ... + 4475.

It is an arithmetic number, because the mean of its divisors is an integer number (899460).

Almost surely, 2^9981897 is an apocalyptic number.

It is an amenable number.

9981897 is a deficient number, since it is larger than the sum of its proper divisors (4409463).

9981897 is a wasteful number, since it uses less digits than its factorization.

9981897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4792.

The product of its digits is 326592, while the sum is 51.

The square root of 9981897 is about 3159.4140279489. The cubic root of 9981897 is about 215.3133847037.

It can be divided in two parts, 9981 and 897, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 9981897 in words is "nine million, nine hundred eighty-one thousand, eight hundred ninety-seven".