9767981 has 4 divisors (see below), whose sum is σ = 9933600. Its totient is φ = 9602364.

The previous prime is 9767977. The next prime is 9767987. The reversal of 9767981 is 1897679.

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: 1897679 = 7 ⋅271097.

It is a cyclic number.

It is not a de Polignac number, because 9767981 - 2² = 9767977 is a prime.

It is a super-2 number, since 2×9767981² = 190826905632722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9767987) 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, 82721 + ... + 82838.

It is an arithmetic number, because the mean of its divisors is an integer number (2483400).

Almost surely, 2^9767981 is an apocalyptic number.

It is an amenable number.

9767981 is a deficient number, since it is larger than the sum of its proper divisors (165619).

9767981 is a wasteful number, since it uses less digits than its factorization.

9767981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165618.

The product of its digits is 190512, while the sum is 47.

The square root of 9767981 is about 3125.3769372669. The cubic root of 9767981 is about 213.7641810867.

The spelling of 9767981 in words is "nine million, seven hundred sixty-seven thousand, nine hundred eighty-one".