161232172 has 12 divisors (see below), whose sum is σ = 289038456. Its totient is φ = 78649760.

The previous prime is 161232167. The next prime is 161232173. The reversal of 161232172 is 271232161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161232173) 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 3 ways as a sum of consecutive naturals, for example, 491398 + ... + 491725.

It is an arithmetic number, because the mean of its divisors is an integer number (24086538).

Almost surely, 2^161232172 is an apocalyptic number.

It is an amenable number.

161232172 is a deficient number, since it is larger than the sum of its proper divisors (127806284).

161232172 is a wasteful number, since it uses less digits than its factorization.

161232172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983168 (or 983166 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 161232172 is about 12697.7231029819. The cubic root of 161232172 is about 544.2735567280.

The spelling of 161232172 in words is "one hundred sixty-one million, two hundred thirty-two thousand, one hundred seventy-two".