161964449 has 16 divisors (see below), whose sum is σ = 172005120. Its totient is φ = 152268480.

The previous prime is 161964431. The next prime is 161964469. The reversal of 161964449 is 944469161.

It is a cyclic number.

It is not a de Polignac number, because 161964449 - 2⁸ = 161964193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161964469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256364 + ... + 256994.

It is an arithmetic number, because the mean of its divisors is an integer number (10750320).

Almost surely, 2^161964449 is an apocalyptic number.

It is an amenable number.

161964449 is a deficient number, since it is larger than the sum of its proper divisors (10040671).

161964449 is a wasteful number, since it uses less digits than its factorization.

161964449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its digits is 186624, while the sum is 44.

The square root of 161964449 is about 12726.5254095531. The cubic root of 161964449 is about 545.0962981087.

The spelling of 161964449 in words is "one hundred sixty-one million, nine hundred sixty-four thousand, four hundred forty-nine".