9621981 has 36 divisors (see below), whose sum is σ = 15183168. Its totient is φ = 5865552.

The previous prime is 9621979. The next prime is 9622001. The reversal of 9621981 is 1891269.

It is not a de Polignac number, because 9621981 - 2¹ = 9621979 is a prime.

It is a super-2 number, since 2×9621981² = 185165036728722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9621971) 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 35 ways as a sum of consecutive naturals, for example, 204700 + ... + 204746.

Almost surely, 2^9621981 is an apocalyptic number.

It is an amenable number.

9621981 is a deficient number, since it is larger than the sum of its proper divisors (5561187).

9621981 is a wasteful number, since it uses less digits than its factorization.

9621981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 116 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 9621981 is about 3101.9318174325. The cubic root of 9621981 is about 212.6938005929.

The spelling of 9621981 in words is "nine million, six hundred twenty-one thousand, nine hundred eighty-one".