161323889 has 12 divisors (see below), whose sum is σ = 174091920. Its totient is φ = 149076000.

The previous prime is 161323843. The next prime is 161323913. The reversal of 161323889 is 988323161.

It is not a de Polignac number, because 161323889 - 2¹⁶ = 161258353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161323189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29414 + ... + 34464.

It is an arithmetic number, because the mean of its divisors is an integer number (14507660).

Almost surely, 2^161323889 is an apocalyptic number.

161323889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

161323889 is a deficient number, since it is larger than the sum of its proper divisors (12768031).

161323889 is an equidigital number, since it uses as much as digits as its factorization.

161323889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152 (or 5111 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 161323889 is about 12701.3341425222. The cubic root of 161323889 is about 544.3767405915.

The spelling of 161323889 in words is "one hundred sixty-one million, three hundred twenty-three thousand, eight hundred eighty-nine".