16516491 has 8 divisors (see below), whose sum is σ = 23181120. Its totient is φ = 10431432.

The previous prime is 16516471. The next prime is 16516579. The reversal of 16516491 is 19461561.

16516491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 16516491 - 2⁶ = 16516427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16516471) 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, 144825 + ... + 144938.

It is an arithmetic number, because the mean of its divisors is an integer number (2897640).

Almost surely, 2^16516491 is an apocalyptic number.

16516491 is a deficient number, since it is larger than the sum of its proper divisors (6664629).

16516491 is a wasteful number, since it uses less digits than its factorization.

16516491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289785.

The product of its digits is 6480, while the sum is 33.

The square root of 16516491 is about 4064.0485971504. The cubic root of 16516491 is about 254.6669546778. Note that the first 3 decimals are identical.

The spelling of 16516491 in words is "sixteen million, five hundred sixteen thousand, four hundred ninety-one".