16081481 has 4 divisors (see below), whose sum is σ = 17318532. Its totient is φ = 14844432.

The previous prime is 16081423. The next prime is 16081487. The reversal of 16081481 is 18418061.

16081481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3936256 + 12145225 = 1984^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 16081481 - 2¹⁸ = 15819337 is a prime.

It is a super-2 number, since 2×16081481² = 517228062306722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16081487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618506 + ... + 618531.

It is an arithmetic number, because the mean of its divisors is an integer number (4329633).

Almost surely, 2^16081481 is an apocalyptic number.

It is an amenable number.

16081481 is a deficient number, since it is larger than the sum of its proper divisors (1237051).

16081481 is a wasteful number, since it uses less digits than its factorization.

16081481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237050.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 16081481 is about 4010.1721908167. The cubic root of 16081481 is about 252.4112343606.

The spelling of 16081481 in words is "sixteen million, eighty-one thousand, four hundred eighty-one".