161174721 has 16 divisors (see below), whose sum is σ = 223292160. Its totient is φ = 103286400.

The previous prime is 161174719. The next prime is 161174737. The reversal of 161174721 is 127471161.

It is not a de Polignac number, because 161174721 - 2¹ = 161174719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161174711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16296 + ... + 24246.

It is an arithmetic number, because the mean of its divisors is an integer number (13955760).

Almost surely, 2^161174721 is an apocalyptic number.

It is an amenable number.

161174721 is a deficient number, since it is larger than the sum of its proper divisors (62117439).

161174721 is a wasteful number, since it uses less digits than its factorization.

161174721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8216.

The product of its digits is 2352, while the sum is 30.

The square root of 161174721 is about 12695.4606454433. The cubic root of 161174721 is about 544.2089030169.

The spelling of 161174721 in words is "one hundred sixty-one million, one hundred seventy-four thousand, seven hundred twenty-one".