16117481 has 4 divisors (see below), whose sum is σ = 16381764. Its totient is φ = 15853200.

The previous prime is 16117477. The next prime is 16117487. The reversal of 16117481 is 18471161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9357481 + 6760000 = 3059^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 16117481 - 2² = 16117477 is a prime.

It is a super-2 number, since 2×16117481² = 519546387570722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16117487) 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, 132050 + ... + 132171.

It is an arithmetic number, because the mean of its divisors is an integer number (4095441).

Almost surely, 2^16117481 is an apocalyptic number.

It is an amenable number.

16117481 is a deficient number, since it is larger than the sum of its proper divisors (264283).

16117481 is an equidigital number, since it uses as much as digits as its factorization.

16117481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264282.

The product of its digits is 1344, while the sum is 29.

The square root of 16117481 is about 4014.6582669014. The cubic root of 16117481 is about 252.5994432344.

The spelling of 16117481 in words is "sixteen million, one hundred seventeen thousand, four hundred eighty-one".