19880161 has 4 divisors (see below), whose sum is σ = 22720192. Its totient is φ = 17040132.

The previous prime is 19880149. The next prime is 19880221. The reversal of 19880161 is 16108891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19880161 - 2⁵ = 19880129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19880101) 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 3 ways as a sum of consecutive naturals, for example, 1420005 + ... + 1420018.

It is an arithmetic number, because the mean of its divisors is an integer number (5680048).

Almost surely, 2^19880161 is an apocalyptic number.

It is an amenable number.

19880161 is a deficient number, since it is larger than the sum of its proper divisors (2840031).

19880161 is an equidigital number, since it uses as much as digits as its factorization.

19880161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840030.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 19880161 is about 4458.7174164775. The cubic root of 19880161 is about 270.8985200302.

The spelling of 19880161 in words is "nineteen million, eight hundred eighty thousand, one hundred sixty-one".