9968181 has 4 divisors (see below), whose sum is σ = 13290912. Its totient is φ = 6645452.

The previous prime is 9968173. The next prime is 9968197. The reversal of 9968181 is 1818699.

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.

It is a cyclic number.

It is not a de Polignac number, because 9968181 - 2³ = 9968173 is a prime.

It is a super-2 number, since 2×9968181² = 198729264897522, which contains 22 as substring.

It is an Ulam 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 (9968381) 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, 1661361 + ... + 1661366.

It is an arithmetic number, because the mean of its divisors is an integer number (3322728).

Almost surely, 2^9968181 is an apocalyptic number.

It is an amenable number.

9968181 is a deficient number, since it is larger than the sum of its proper divisors (3322731).

9968181 is a wasteful number, since it uses less digits than its factorization.

9968181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322730.

The product of its digits is 31104, while the sum is 42.

The square root of 9968181 is about 3157.2426260901. The cubic root of 9968181 is about 215.2147196875.

The spelling of 9968181 in words is "nine million, nine hundred sixty-eight thousand, one hundred eighty-one".