161667089 has 4 divisors (see below), whose sum is σ = 161806320. Its totient is φ = 161527860.

The previous prime is 161667073. The next prime is 161667109. The reversal of 161667089 is 980766161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 980766161 = 23 ⋅42642007.

It is a cyclic number.

It is not a de Polignac number, because 161667089 - 2⁴ = 161667073 is a prime.

It is a super-2 number, since 2×161667089² = 52272495331467842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161667589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67859 + ... + 70200.

It is an arithmetic number, because the mean of its divisors is an integer number (40451580).

Almost surely, 2^161667089 is an apocalyptic number.

It is an amenable number.

161667089 is a deficient number, since it is larger than the sum of its proper divisors (139231).

161667089 is a wasteful number, since it uses less digits than its factorization.

161667089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139230.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 161667089 is about 12714.8373564116. The cubic root of 161667089 is about 544.7625023606.

The spelling of 161667089 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, eighty-nine".