16516493 has 4 divisors (see below), whose sum is σ = 18876000. Its totient is φ = 14156988.

The previous prime is 16516471. The next prime is 16516579. The reversal of 16516493 is 39461561.

16516493 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, and also an emirpimes, since its reverse is a distinct semiprime: 39461561 = 2789 ⋅14149.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16516493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16516993) 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, 1179743 + ... + 1179756.

It is an arithmetic number, because the mean of its divisors is an integer number (4719000).

Almost surely, 2^16516493 is an apocalyptic number.

It is an amenable number.

16516493 is a deficient number, since it is larger than the sum of its proper divisors (2359507).

16516493 is an equidigital number, since it uses as much as digits as its factorization.

16516493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359506.

The product of its digits is 19440, while the sum is 35.

The square root of 16516493 is about 4064.0488432104. The cubic root of 16516493 is about 254.6669649571. Note that the first 3 decimals are identical.

The spelling of 16516493 in words is "sixteen million, five hundred sixteen thousand, four hundred ninety-three".