161073289 has 4 divisors (see below), whose sum is σ = 173463556. Its totient is φ = 148683024.

The previous prime is 161073287. The next prime is 161073299. The reversal of 161073289 is 982370161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982370161 = 12301 ⋅79861.

It can be written as a sum of positive squares in 2 ways, for example, as 98346889 + 62726400 = 9917^2 + 7920^2 .

It is a cyclic number.

It is not a de Polignac number, because 161073289 - 2¹ = 161073287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161073281) 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, 6195114 + ... + 6195139.

It is an arithmetic number, because the mean of its divisors is an integer number (43365889).

Almost surely, 2^161073289 is an apocalyptic number.

It is an amenable number.

161073289 is a deficient number, since it is larger than the sum of its proper divisors (12390267).

161073289 is a wasteful number, since it uses less digits than its factorization.

161073289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12390266.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 161073289 is about 12691.4652030410. The cubic root of 161073289 is about 544.0947168284.

The spelling of 161073289 in words is "one hundred sixty-one million, seventy-three thousand, two hundred eighty-nine".