161992005 has 32 divisors (see below), whose sum is σ = 311808000. Its totient is φ = 70155072.

The previous prime is 161992003. The next prime is 161992007. The reversal of 161992005 is 500299161.

It is an interprime number because it is at equal distance from previous prime (161992003) and next prime (161992007).

It is not a de Polignac number, because 161992005 - 2¹ = 161992003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161992001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38605 + ... + 42594.

It is an arithmetic number, because the mean of its divisors is an integer number (9744000).

Almost surely, 2^161992005 is an apocalyptic number.

161992005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161992005 is a deficient number, since it is larger than the sum of its proper divisors (149815995).

161992005 is a wasteful number, since it uses less digits than its factorization.

161992005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81233.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 161992005 is about 12727.6079842208. The cubic root of 161992005 is about 545.1272098755.

The spelling of 161992005 in words is "one hundred sixty-one million, nine hundred ninety-two thousand, five".