16518481 has 4 divisors (see below), whose sum is σ = 18878272. Its totient is φ = 14158692.

The previous prime is 16518473. The next prime is 16518499. The reversal of 16518481 is 18481561.

It is a happy number.

16518481 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16518481 - 2³ = 16518473 is a prime.

It is a super-2 number, since 2×16518481² = 545720429094722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16518431) 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, 1179885 + ... + 1179898.

It is an arithmetic number, because the mean of its divisors is an integer number (4719568).

Almost surely, 2^16518481 is an apocalyptic number.

It is an amenable number.

16518481 is a deficient number, since it is larger than the sum of its proper divisors (2359791).

16518481 is an equidigital number, since it uses as much as digits as its factorization.

16518481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359790.

The product of its digits is 7680, while the sum is 34.

The square root of 16518481 is about 4064.2934195257. The cubic root of 16518481 is about 254.6771821707.

The spelling of 16518481 in words is "sixteen million, five hundred eighteen thousand, four hundred eighty-one".