9999974161 has 2 divisors, whose sum is σ = 9999974162. Its totient is φ = 9999974160.

The previous prime is 9999974123. The next prime is 9999974167. The reversal of 9999974161 is 1614799999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7046595136 + 2953379025 = 83944^2 + 54345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999974161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9999974093 and 9999974102.

It is not a weakly prime, because it can be changed into another prime (9999974167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999987080 + 4999987081.

It is an arithmetic number, because the mean of its divisors is an integer number (4999987081).

Almost surely, 2^9999974161 is an apocalyptic number.

It is an amenable number.

9999974161 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999974161 is an equidigital number, since it uses as much as digits as its factorization.

9999974161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9920232, while the sum is 64.

The square root of 9999974161 is about 99999.8708049165. The cubic root of 9999974161 is about 2154.4328344157.

The spelling of 9999974161 in words is "nine billion, nine hundred ninety-nine million, nine hundred seventy-four thousand, one hundred sixty-one".