161828989 has 16 divisors (see below), whose sum is σ = 193996800. Its totient is φ = 131986800.

The previous prime is 161828969. The next prime is 161828993. The reversal of 161828989 is 989828161.

161828989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161828989 - 2⁹ = 161828477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161828929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29514 + ... + 34564.

It is an arithmetic number, because the mean of its divisors is an integer number (12124800).

Almost surely, 2^161828989 is an apocalyptic number.

It is an amenable number.

161828989 is a deficient number, since it is larger than the sum of its proper divisors (32167811).

161828989 is a wasteful number, since it uses less digits than its factorization.

161828989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280.

The product of its digits is 497664, while the sum is 52.

The square root of 161828989 is about 12721.2023409739. The cubic root of 161828989 is about 544.9442908015.

The spelling of 161828989 in words is "one hundred sixty-one million, eight hundred twenty-eight thousand, nine hundred eighty-nine".