97197581 has 8 divisors (see below), whose sum is σ = 105126840. Its totient is φ = 89332992.

The previous prime is 97197497. The next prime is 97197599. The reversal of 97197581 is 18579179.

It can be written as a sum of positive squares in 4 ways, for example, as 8649481 + 88548100 = 2941^2 + 9410^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97197581 - 2¹⁸ = 96935437 is a prime.

It is a super-2 number, since 2×97197581² = 18894739504503122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97197281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13016 + ... + 19073.

It is an arithmetic number, because the mean of its divisors is an integer number (13140855).

Almost surely, 2^97197581 is an apocalyptic number.

It is an amenable number.

97197581 is a deficient number, since it is larger than the sum of its proper divisors (7929259).

97197581 is a wasteful number, since it uses less digits than its factorization.

97197581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32335.

The product of its digits is 158760, while the sum is 47.

The square root of 97197581 is about 9858.8833546198. The cubic root of 97197581 is about 459.7818452018.

The spelling of 97197581 in words is "ninety-seven million, one hundred ninety-seven thousand, five hundred eighty-one".