161829889 has 32 divisors (see below), whose sum is σ = 189987840. Its totient is φ = 136684800.

The previous prime is 161829839. The next prime is 161829929. The reversal of 161829889 is 988928161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161829889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161829809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 712794 + ... + 713020.

It is an arithmetic number, because the mean of its divisors is an integer number (5937120).

Almost surely, 2^161829889 is an apocalyptic number.

It is an amenable number.

161829889 is a deficient number, since it is larger than the sum of its proper divisors (28157951).

161829889 is a wasteful number, since it uses less digits than its factorization.

161829889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

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

The square root of 161829889 is about 12721.2377149395. The cubic root of 161829889 is about 544.9453010221.

The spelling of 161829889 in words is "one hundred sixty-one million, eight hundred twenty-nine thousand, eight hundred eighty-nine".