16198813 has 4 divisors (see below), whose sum is σ = 16593948. Its totient is φ = 15803680.

The previous prime is 16198783. The next prime is 16198843. The reversal of 16198813 is 31889161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31889161 = 17 ⋅1875833.

It is an interprime number because it is at equal distance from previous prime (16198783) and next prime (16198843).

It can be written as a sum of positive squares in 2 ways, for example, as 3617604 + 12581209 = 1902^2 + 3547^2 .

It is a cyclic number.

It is not a de Polignac number, because 16198813 - 2⁵ = 16198781 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 (16198843) 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, 197506 + ... + 197587.

It is an arithmetic number, because the mean of its divisors is an integer number (4148487).

Almost surely, 2^16198813 is an apocalyptic number.

It is an amenable number.

16198813 is a deficient number, since it is larger than the sum of its proper divisors (395135).

16198813 is an equidigital number, since it uses as much as digits as its factorization.

16198813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395134.

The product of its digits is 10368, while the sum is 37.

The square root of 16198813 is about 4024.7749005379. The cubic root of 16198813 is about 253.0236194731.

The spelling of 16198813 in words is "sixteen million, one hundred ninety-eight thousand, eight hundred thirteen".