9209981 has 4 divisors (see below), whose sum is σ = 10047264. Its totient is φ = 8372700.

The previous prime is 9209957. The next prime is 9209983. The reversal of 9209981 is 1899029.

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 9209981 - 2⁶ = 9209917 is a prime.

It is a super-2 number, since 2×9209981² = 169647500040722, 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 (9209983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418625 + ... + 418646.

It is an arithmetic number, because the mean of its divisors is an integer number (2511816).

Almost surely, 2^9209981 is an apocalyptic number.

It is an amenable number.

9209981 is a deficient number, since it is larger than the sum of its proper divisors (837283).

9209981 is a wasteful number, since it uses less digits than its factorization.

9209981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837282.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 9209981 is about 3034.7950507407. The cubic root of 9209981 is about 209.6136585339.

It can be divided in two parts, 920 and 9981, that added together give a palindrome (10901).

The spelling of 9209981 in words is "nine million, two hundred nine thousand, nine hundred eighty-one".