97209581 has 12 divisors (see below), whose sum is σ = 113461920. Its totient is φ = 83041560.

The previous prime is 97209577. The next prime is 97209589. The reversal of 97209581 is 18590279.

It is not a de Polignac number, because 97209581 - 2² = 97209577 is a prime.

It is a super-2 number, since 2×97209581² = 18899405276391122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97209589) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12050 + ... + 18428.

It is an arithmetic number, because the mean of its divisors is an integer number (9455160).

Almost surely, 2^97209581 is an apocalyptic number.

It is an amenable number.

97209581 is a deficient number, since it is larger than the sum of its proper divisors (16252339).

97209581 is a wasteful number, since it uses less digits than its factorization.

97209581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704 (or 6697 counting only the distinct ones).

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

The square root of 97209581 is about 9859.4919240294. The cubic root of 97209581 is about 459.8007659576.

The spelling of 97209581 in words is "ninety-seven million, two hundred nine thousand, five hundred eighty-one".