97691878249 has 9 divisors (see below), whose sum is σ = 113644117821. Its totient is φ = 83734020300.

The previous prime is 97691878243. The next prime is 97691878267. The reversal of 97691878249 is 94287819679.

The square root of 97691878249 is 312557.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 97691878249 - 2⁷ = 97691878121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97691878243) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2165574 + ... + 2210224.

Almost surely, 2^97691878249 is an apocalyptic number.

97691878249 is the 312557-th square number.

97691878249 is the 156279-th centered octagonal number.

It is an amenable number.

97691878249 is a deficient number, since it is larger than the sum of its proper divisors (15952239572).

97691878249 is an frugal number, since it uses more digits than its factorization.

97691878249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89316 (or 44658 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 70.

The spelling of 97691878249 in words is "ninety-seven billion, six hundred ninety-one million, eight hundred seventy-eight thousand, two hundred forty-nine".