97971217979 has 4 divisors (see below), whose sum is σ = 102230836176. Its totient is φ = 93711599784.

The previous prime is 97971217961. The next prime is 97971218053.

97971217979 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97971217979 - 2³⁶ = 29251741243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97971217909) 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, 2129809064 + ... + 2129809109.

It is an arithmetic number, because the mean of its divisors is an integer number (25557709044).

Almost surely, 2^97971217979 is an apocalyptic number.

97971217979 is a deficient number, since it is larger than the sum of its proper divisors (4259618197).

97971217979 is a wasteful number, since it uses less digits than its factorization.

97971217979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259618196.

The product of its digits is 31505922, while the sum is 68.

The spelling of 97971217979 in words is "ninety-seven billion, nine hundred seventy-one million, two hundred seventeen thousand, nine hundred seventy-nine".