161545089 has 4 divisors (see below), whose sum is σ = 215393456. Its totient is φ = 107696724.

The previous prime is 161545081. The next prime is 161545091. The reversal of 161545089 is 980545161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161545089 - 2³ = 161545081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161545081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26924179 + ... + 26924184.

It is an arithmetic number, because the mean of its divisors is an integer number (53848364).

Almost surely, 2^161545089 is an apocalyptic number.

It is an amenable number.

161545089 is a deficient number, since it is larger than the sum of its proper divisors (53848367).

161545089 is an equidigital number, since it uses as much as digits as its factorization.

161545089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53848366.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 161545089 is about 12710.0389063134. The cubic root of 161545089 is about 544.6254351923.

The spelling of 161545089 in words is "one hundred sixty-one million, five hundred forty-five thousand, eighty-nine".