9956981 has 4 divisors (see below), whose sum is σ = 10093452. Its totient is φ = 9820512.

The previous prime is 9956977. The next prime is 9956993. The reversal of 9956981 is 1896599.

9956981 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3118756 + 6838225 = 1766^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 9956981 - 2² = 9956977 is a prime.

It is a super-2 number, since 2×9956981² = 198282941268722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9956911) 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, 68126 + ... + 68271.

It is an arithmetic number, because the mean of its divisors is an integer number (2523363).

Almost surely, 2^9956981 is an apocalyptic number.

It is an amenable number.

9956981 is a deficient number, since it is larger than the sum of its proper divisors (136471).

9956981 is a wasteful number, since it uses less digits than its factorization.

9956981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136470.

The product of its digits is 174960, while the sum is 47.

The square root of 9956981 is about 3155.4684279834. The cubic root of 9956981 is about 215.1340861804.

The spelling of 9956981 in words is "nine million, nine hundred fifty-six thousand, nine hundred eighty-one".