161992 has 8 divisors (see below), whose sum is σ = 303750. Its totient is φ = 80992.

The previous prime is 161983. The next prime is 161999. The reversal of 161992 is 299161.

It can be written as a sum of positive squares in only one way, i.e., 148996 + 12996 = 386^2 + 114^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 161992.

It is not an unprimeable number, because it can be changed into a prime (161999) by changing a digit.

161992 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 as a sum of consecutive naturals, namely, 10117 + ... + 10132.

2¹⁶¹⁹⁹² is an apocalyptic number.

It is an amenable number.

161992 is a deficient number, since it is larger than the sum of its proper divisors (141758).

161992 is a wasteful number, since it uses less digits than its factorization.

161992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20255 (or 20251 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The square root of 161992 is about 402.4822977474. The cubic root of 161992 is about 54.5127204267.

It can be divided in two parts, 1619 and 92, that added together give a triangular number (1711 = T₅₈).

The spelling of 161992 in words is "one hundred sixty-one thousand, nine hundred ninety-two".