16197881 has 6 divisors (see below), whose sum is σ = 18842490. Its totient is φ = 13883856.

The previous prime is 16197859. The next prime is 16197901. The reversal of 16197881 is 18879161.

It can be written as a sum of positive squares in only one way, i.e., 8357881 + 7840000 = 2891^2 + 2800^2 .

It is not a de Polignac number, because 16197881 - 2¹⁴ = 16181497 is a prime.

It is a super-2 number, since 2×16197881² = 524742697780322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16197581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165236 + ... + 165333.

It is an arithmetic number, because the mean of its divisors is an integer number (3140415).

Almost surely, 2^16197881 is an apocalyptic number.

It is an amenable number.

16197881 is a deficient number, since it is larger than the sum of its proper divisors (2644609).

16197881 is an equidigital number, since it uses as much as digits as its factorization.

16197881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330583 (or 330576 counting only the distinct ones).

The product of its digits is 24192, while the sum is 41.

The square root of 16197881 is about 4024.6591159998. The cubic root of 16197881 is about 253.0187668020.

The spelling of 16197881 in words is "sixteen million, one hundred ninety-seven thousand, eight hundred eighty-one".