161930 has 8 divisors (see below), whose sum is σ = 291492. Its totient is φ = 64768.

The previous prime is 161923. The next prime is 161947. The reversal of 161930 is 39161.

161930 = T₂₅₂ + T₂₅₃ + ... + T₂₅₆.

It can be written as a sum of positive squares in 2 ways, for example, as 151321 + 10609 = 389^2 + 103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is an unprimeable number.

161930 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8087 + ... + 8106.

2¹⁶¹⁹³⁰ is an apocalyptic number.

161930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161930 is a deficient number, since it is larger than the sum of its proper divisors (129562).

161930 is a wasteful number, since it uses less digits than its factorization.

161930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16200.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 161930 is about 402.4052683552. The cubic root of 161930 is about 54.5057648981.

The spelling of 161930 in words is "one hundred sixty-one thousand, nine hundred thirty".