161304247129 has 3 divisors (see below), whose sum is σ = 161304648757. Its totient is φ = 161303845502.

The previous prime is 161304247109. The next prime is 161304247187. The reversal of 161304247129 is 921742403161.

The square root of 161304247129 is 401627.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 921742403161 = 4357 ⋅211554373.

It is not a de Polignac number, because 161304247129 - 2⁷ = 161304247001 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161304247091 and 161304247100.

It is not an unprimeable number, because it can be changed into a prime (161304247109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 200814 + ... + 602440.

Almost surely, 2^161304247129 is an apocalyptic number.

161304247129 is the 401627-th square number.

161304247129 is the 200814-th centered octagonal number.

It is an amenable number.

161304247129 is a deficient number, since it is larger than the sum of its proper divisors (401628).

161304247129 is an frugal number, since it uses more digits than its factorization.

161304247129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803254 (or 401627 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 161304247129 in words is "one hundred sixty-one billion, three hundred four million, two hundred forty-seven thousand, one hundred twenty-nine".