16055981 has 4 divisors (see below), whose sum is σ = 16162464. Its totient is φ = 15949500.

The previous prime is 16055953. The next prime is 16055987. The reversal of 16055981 is 18955061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18955061 = 97 ⋅195413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16055981 is a prime.

It is a super-2 number, since 2×16055981² = 515589051744722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16055987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53015 + ... + 53316.

It is an arithmetic number, because the mean of its divisors is an integer number (4040616).

Almost surely, 2^16055981 is an apocalyptic number.

It is an amenable number.

16055981 is a deficient number, since it is larger than the sum of its proper divisors (106483).

16055981 is a wasteful number, since it uses less digits than its factorization.

16055981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106482.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 16055981 is about 4006.9915148400. The cubic root of 16055981 is about 252.2777497324.

The spelling of 16055981 in words is "sixteen million, fifty-five thousand, nine hundred eighty-one".