161173830 has 32 divisors (see below), whose sum is σ = 388009728. Its totient is φ = 42847200.

The previous prime is 161173823. The next prime is 161173841. The reversal of 161173830 is 38371161.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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, 1815 + ... + 18045.

It is an arithmetic number, because the mean of its divisors is an integer number (12125304).

Almost surely, 2^161173830 is an apocalyptic number.

161173830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161173830 is an abundant number, since it is smaller than the sum of its proper divisors (226835898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161173830 is a wasteful number, since it uses less digits than its factorization.

161173830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16572.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 161173830 is about 12695.4255541120. The cubic root of 161173830 is about 544.2079001900.

The spelling of 161173830 in words is "one hundred sixty-one million, one hundred seventy-three thousand, eight hundred thirty".