9807981 has 4 divisors (see below), whose sum is σ = 13077312. Its totient is φ = 6538652.

The previous prime is 9807953. The next prime is 9807991. The reversal of 9807981 is 1897089.

9807981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1897089 = 3 ⋅632363.

It is a cyclic number.

It is not a de Polignac number, because 9807981 - 2⁵ = 9807949 is a prime.

It is a super-2 number, since 2×9807981² = 192392982592722, which contains 22 as substring.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9807911) 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, 1634661 + ... + 1634666.

It is an arithmetic number, because the mean of its divisors is an integer number (3269328).

Almost surely, 2^9807981 is an apocalyptic number.

It is an amenable number.

9807981 is a deficient number, since it is larger than the sum of its proper divisors (3269331).

9807981 is a wasteful number, since it uses less digits than its factorization.

9807981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269330.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 9807981 is about 3131.7696275429. The cubic root of 9807981 is about 214.0555726637.

The spelling of 9807981 in words is "nine million, eight hundred seven thousand, nine hundred eighty-one".