9777981 has 16 divisors (see below), whose sum is σ = 13353984. Its totient is φ = 6362544.

The previous prime is 9777979. The next prime is 9778001. The reversal of 9777981 is 1897779.

9777981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9777981 - 2¹ = 9777979 is a prime.

It is a super-2 number, since 2×9777981² = 191217824872722, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 9777981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9772981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26460 + ... + 26826.

It is an arithmetic number, because the mean of its divisors is an integer number (834624).

Almost surely, 2^9777981 is an apocalyptic number.

It is an amenable number.

9777981 is a deficient number, since it is larger than the sum of its proper divisors (3576003).

9777981 is a wasteful number, since it uses less digits than its factorization.

9777981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560.

The product of its digits is 222264, while the sum is 48.

The square root of 9777981 is about 3126.9763350560. The cubic root of 9777981 is about 213.8371034491.

The spelling of 9777981 in words is "nine million, seven hundred seventy-seven thousand, nine hundred eighty-one".