9097981 has 2 divisors, whose sum is σ = 9097982. Its totient is φ = 9097980.

The previous prime is 9097961. The next prime is 9097987. The reversal of 9097981 is 1897909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7812025 + 1285956 = 2795^2 + 1134^2 .

It is a cyclic number.

It is not a de Polignac number, because 9097981 - 2⁷ = 9097853 is a prime.

It is a super-2 number, since 2×9097981² = 165546516552722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9097987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4548990 + 4548991.

It is an arithmetic number, because the mean of its divisors is an integer number (4548991).

Almost surely, 2^9097981 is an apocalyptic number.

It is an amenable number.

9097981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9097981 is an equidigital number, since it uses as much as digits as its factorization.

9097981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 9097981 is about 3016.2859612444. The cubic root of 9097981 is about 208.7605064811.

The spelling of 9097981 in words is "nine million, ninety-seven thousand, nine hundred eighty-one".