9321981 has 4 divisors (see below), whose sum is σ = 12429312. Its totient is φ = 6214652.

The previous prime is 9321973. The next prime is 9322009. The reversal of 9321981 is 1891239.

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 9321981 - 2³ = 9321973 is a prime.

It is a super-2 number, since 2×9321981² = 173798659528722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9321901) 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, 1553661 + ... + 1553666.

It is an arithmetic number, because the mean of its divisors is an integer number (3107328).

Almost surely, 2^9321981 is an apocalyptic number.

It is an amenable number.

9321981 is a deficient number, since it is larger than the sum of its proper divisors (3107331).

9321981 is a wasteful number, since it uses less digits than its factorization.

9321981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107330.

The product of its digits is 3888, while the sum is 33.

The square root of 9321981 is about 3053.1919363184. The cubic root of 9321981 is about 210.4599216938.

The spelling of 9321981 in words is "nine million, three hundred twenty-one thousand, nine hundred eighty-one".