97915617121 has 4 divisors (see below), whose sum is σ = 111903562432. Its totient is φ = 83927671812.

The previous prime is 97915617109. The next prime is 97915617143. The reversal of 97915617121 is 12171651979.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12171651979 = 37 ⋅328963567.

It is a cyclic number.

It is not a de Polignac number, because 97915617121 - 2²¹ = 97913519969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97915615121) 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, 6993972645 + ... + 6993972658.

It is an arithmetic number, because the mean of its divisors is an integer number (27975890608).

Almost surely, 2^97915617121 is an apocalyptic number.

It is an amenable number.

97915617121 is a deficient number, since it is larger than the sum of its proper divisors (13987945311).

97915617121 is a wasteful number, since it uses less digits than its factorization.

97915617121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13987945310.

The product of its digits is 238140, while the sum is 49.

The spelling of 97915617121 in words is "ninety-seven billion, nine hundred fifteen million, six hundred seventeen thousand, one hundred twenty-one".