16099999 has 4 divisors (see below), whose sum is σ = 16198936. Its totient is φ = 16001064.

The previous prime is 16099987. The next prime is 16100027. The reversal of 16099999 is 99999061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99999061 = 181 ⋅552481.

It is a cyclic number.

It is not a de Polignac number, because 16099999 - 2⁷ = 16099871 is a prime.

It is a Duffinian number.

16099999 is a modest number, since divided by 9999 gives 1609 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16090999) 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, 49224 + ... + 49549.

It is an arithmetic number, because the mean of its divisors is an integer number (4049734).

Almost surely, 2^16099999 is an apocalyptic number.

16099999 is a deficient number, since it is larger than the sum of its proper divisors (98937).

16099999 is an equidigital number, since it uses as much as digits as its factorization.

16099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98936.

The product of its (nonzero) digits is 354294, while the sum is 52.

The square root of 16099999 is about 4012.4804049366. The cubic root of 16099999 is about 252.5080819555.

The spelling of 16099999 in words is "sixteen million, ninety-nine thousand, nine hundred ninety-nine".