161328899 has 4 divisors (see below), whose sum is σ = 161391120. Its totient is φ = 161266680.

The previous prime is 161328889. The next prime is 161328907. The reversal of 161328899 is 998823161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161328899 - 2⁴ = 161328883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161328889) 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, 27044 + ... + 32465.

It is an arithmetic number, because the mean of its divisors is an integer number (40347780).

Almost surely, 2^161328899 is an apocalyptic number.

161328899 is a deficient number, since it is larger than the sum of its proper divisors (62221).

161328899 is an equidigital number, since it uses as much as digits as its factorization.

161328899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62220.

The product of its digits is 186624, while the sum is 47.

The square root of 161328899 is about 12701.5313643671. The cubic root of 161328899 is about 544.3823758372.

The spelling of 161328899 in words is "one hundred sixty-one million, three hundred twenty-eight thousand, eight hundred ninety-nine".