97911689 has 4 divisors (see below), whose sum is σ = 98163780. Its totient is φ = 97659600.

The previous prime is 97911679. The next prime is 97911691. The reversal of 97911689 is 98611979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98611979 = 8807 ⋅11197.

It can be written as a sum of positive squares in 2 ways, for example, as 21086464 + 76825225 = 4592^2 + 8765^2 .

It is a cyclic number.

It is not a de Polignac number, because 97911689 - 2⁴ = 97911673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97911629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125462 + ... + 126239.

It is an arithmetic number, because the mean of its divisors is an integer number (24540945).

Almost surely, 2^97911689 is an apocalyptic number.

It is an amenable number.

97911689 is a deficient number, since it is larger than the sum of its proper divisors (252091).

97911689 is a wasteful number, since it uses less digits than its factorization.

97911689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252090.

The product of its digits is 244944, while the sum is 50.

The square root of 97911689 is about 9895.0335522423. The cubic root of 97911689 is about 460.9051004303.

The spelling of 97911689 in words is "ninety-seven million, nine hundred eleven thousand, six hundred eighty-nine".