97581569 has 2 divisors, whose sum is σ = 97581570. Its totient is φ = 97581568.

The previous prime is 97581559. The next prime is 97581611. The reversal of 97581569 is 96518579.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68690944 + 28890625 = 8288^2 + 5375^2 .

It is an emirp because it is prime and its reverse (96518579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97581569 - 2⁴ = 97581553 is a prime.

It is a super-2 number, since 2×97581569² = 19044325217003522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (97581529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48790784 + 48790785.

It is an arithmetic number, because the mean of its divisors is an integer number (48790785).

Almost surely, 2^97581569 is an apocalyptic number.

It is an amenable number.

97581569 is a deficient number, since it is larger than the sum of its proper divisors (1).

97581569 is an equidigital number, since it uses as much as digits as its factorization.

97581569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 97581569 is about 9878.3383724187. The cubic root of 97581569 is about 460.3865198072.

The spelling of 97581569 in words is "ninety-seven million, five hundred eighty-one thousand, five hundred sixty-nine".