161457189 has 8 divisors (see below), whose sum is σ = 215360640. Its totient is φ = 107595936.

The previous prime is 161457187. The next prime is 161457209. The reversal of 161457189 is 981754161.

161457189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161457189 - 2¹ = 161457187 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161457189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161457187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157 + ... + 17970.

It is an arithmetic number, because the mean of its divisors is an integer number (26920080).

Almost surely, 2^161457189 is an apocalyptic number.

It is an amenable number.

161457189 is a deficient number, since it is larger than the sum of its proper divisors (53903451).

161457189 is a wasteful number, since it uses less digits than its factorization.

161457189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21099.

The product of its digits is 60480, while the sum is 42.

The square root of 161457189 is about 12706.5805392324. The cubic root of 161457189 is about 544.5266366433.

The spelling of 161457189 in words is "one hundred sixty-one million, four hundred fifty-seven thousand, one hundred eighty-nine".