9997162121 has 2 divisors, whose sum is σ = 9997162122. Its totient is φ = 9997162120.

The previous prime is 9997162079. The next prime is 9997162139. The reversal of 9997162121 is 1212617999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8511907600 + 1485254521 = 92260^2 + 38539^2 .

It is an emirp because it is prime and its reverse (1212617999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9997162121 - 2⁶ = 9997162057 is a prime.

It is not a weakly prime, because it can be changed into another prime (9997162621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998581060 + 4998581061.

It is an arithmetic number, because the mean of its divisors is an integer number (4998581061).

Almost surely, 2^9997162121 is an apocalyptic number.

It is an amenable number.

9997162121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997162121 is an equidigital number, since it uses as much as digits as its factorization.

9997162121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 9997162121 is about 99985.8095981625. The cubic root of 9997162121 is about 2154.2308699180.

The spelling of 9997162121 in words is "nine billion, nine hundred ninety-seven million, one hundred sixty-two thousand, one hundred twenty-one".