161658089 has 2 divisors, whose sum is σ = 161658090. Its totient is φ = 161658088.

The previous prime is 161658073. The next prime is 161658127. The reversal of 161658089 is 980856161.

161658089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93760489 + 67897600 = 9683^2 + 8240^2 .

It is a cyclic number.

It is not a de Polignac number, because 161658089 - 2⁴ = 161658073 is a prime.

It is a super-2 number, since 2×161658089² = 52266675478263842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161658589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80829044 + 80829045.

It is an arithmetic number, because the mean of its divisors is an integer number (80829045).

Almost surely, 2^161658089 is an apocalyptic number.

It is an amenable number.

161658089 is a deficient number, since it is larger than the sum of its proper divisors (1).

161658089 is an equidigital number, since it uses as much as digits as its factorization.

161658089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 161658089 is about 12714.4834342572. The cubic root of 161658089 is about 544.7523932046.

The spelling of 161658089 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, eighty-nine".