161995299 has 4 divisors (see below), whose sum is σ = 215993736. Its totient is φ = 107996864.

The previous prime is 161995289. The next prime is 161995303. The reversal of 161995299 is 992599161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 992599161 = 3 ⋅330866387.

It is a cyclic number.

It is not a de Polignac number, because 161995299 - 2⁴ = 161995283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161995289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26999214 + ... + 26999219.

It is an arithmetic number, because the mean of its divisors is an integer number (53998434).

Almost surely, 2^161995299 is an apocalyptic number.

161995299 is a deficient number, since it is larger than the sum of its proper divisors (53998437).

161995299 is an equidigital number, since it uses as much as digits as its factorization.

161995299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53998436.

The product of its digits is 393660, while the sum is 51.

The square root of 161995299 is about 12727.7373872971. The cubic root of 161995299 is about 545.1309047839.

The spelling of 161995299 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, two hundred ninety-nine".