9972581 has 2 divisors, whose sum is σ = 9972582. Its totient is φ = 9972580.

The previous prime is 9972577. The next prime is 9972583. The reversal of 9972581 is 1852799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7896100 + 2076481 = 2810^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 9972581 - 2² = 9972577 is a prime.

It is a super-2 number, since 2×9972581² = 198904743603122, which contains 22 as substring.

Together with 9972583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9972583) 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 as a sum of consecutive naturals, namely, 4986290 + 4986291.

It is an arithmetic number, because the mean of its divisors is an integer number (4986291).

Almost surely, 2^9972581 is an apocalyptic number.

It is an amenable number.

9972581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9972581 is an equidigital number, since it uses as much as digits as its factorization.

9972581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 41.

The square root of 9972581 is about 3157.9393597724. The cubic root of 9972581 is about 215.2463806118.

The spelling of 9972581 in words is "nine million, nine hundred seventy-two thousand, five hundred eighty-one".