97121756161 has 8 divisors (see below), whose sum is σ = 99517559400. Its totient is φ = 94727237760.

The previous prime is 97121756159. The next prime is 97121756191. The reversal of 97121756161 is 16165712179.

It can be written as a sum of positive squares in 4 ways, for example, as 214066161 + 96907690000 = 14631^2 + 311300^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97121756161 - 2¹ = 97121756159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97121756101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167266 + ... + 471403.

It is an arithmetic number, because the mean of its divisors is an integer number (12439694925).

Almost surely, 2^97121756161 is an apocalyptic number.

It is an amenable number.

97121756161 is a deficient number, since it is larger than the sum of its proper divisors (2395803239).

97121756161 is a wasteful number, since it uses less digits than its factorization.

97121756161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642419.

The product of its digits is 158760, while the sum is 46.

The spelling of 97121756161 in words is "ninety-seven billion, one hundred twenty-one million, seven hundred fifty-six thousand, one hundred sixty-one".