16181481 has 8 divisors (see below), whose sum is σ = 21733344. Its totient is φ = 10708640.

The previous prime is 16181479. The next prime is 16181497. The reversal of 16181481 is 18418161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16181481 - 2¹ = 16181479 is a prime.

It is a super-2 number, since 2×16181481² = 523680654706722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16181401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19275 + ... + 20096.

It is an arithmetic number, because the mean of its divisors is an integer number (2716668).

Almost surely, 2^16181481 is an apocalyptic number.

It is an amenable number.

16181481 is a deficient number, since it is larger than the sum of its proper divisors (5551863).

16181481 is a wasteful number, since it uses less digits than its factorization.

16181481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39511.

The product of its digits is 1536, while the sum is 30.

The square root of 16181481 is about 4022.6211603878. The cubic root of 16181481 is about 252.9333459787.

The spelling of 16181481 in words is "sixteen million, one hundred eighty-one thousand, four hundred eighty-one".