97566581 has 4 divisors (see below), whose sum is σ = 111504672. Its totient is φ = 83628492.

The previous prime is 97566571. The next prime is 97566619. The reversal of 97566581 is 18566579.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18566579 = 541 ⋅34319.

It is a cyclic number.

It is not a de Polignac number, because 97566581 - 2¹⁰ = 97565557 is a prime.

It is a super-2 number, since 2×97566581² = 19038475456059122, 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 (97566571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6969035 + ... + 6969048.

It is an arithmetic number, because the mean of its divisors is an integer number (27876168).

Almost surely, 2^97566581 is an apocalyptic number.

It is an amenable number.

97566581 is a deficient number, since it is larger than the sum of its proper divisors (13938091).

97566581 is a wasteful number, since it uses less digits than its factorization.

97566581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13938090.

The product of its digits is 453600, while the sum is 47.

The square root of 97566581 is about 9877.5797136748. The cubic root of 97566581 is about 460.3629476424.

The spelling of 97566581 in words is "ninety-seven million, five hundred sixty-six thousand, five hundred eighty-one".