16515997 has 8 divisors (see below), whose sum is σ = 17582400. Its totient is φ = 15469344.

The previous prime is 16515973. The next prime is 16516009. The reversal of 16515997 is 79951561.

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

It is not a de Polignac number, because 16515997 - 2⁷ = 16515869 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 (16515937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3193 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (2197800).

Almost surely, 2^16515997 is an apocalyptic number.

It is an amenable number.

16515997 is a deficient number, since it is larger than the sum of its proper divisors (1066403).

16515997 is an equidigital number, since it uses as much as digits as its factorization.

16515997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9875.

The product of its digits is 85050, while the sum is 43.

The square root of 16515997 is about 4063.9878198636. The cubic root of 16515997 is about 254.6644156653.

The spelling of 16515997 in words is "sixteen million, five hundred fifteen thousand, nine hundred ninety-seven".