16099861 has 4 divisors (see below), whose sum is σ = 16372800. Its totient is φ = 15826924.

The previous prime is 16099841. The next prime is 16099871. The reversal of 16099861 is 16899061.

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: 16899061 = 31 ⋅545131.

It is a cyclic number.

It is not a de Polignac number, because 16099861 - 2¹⁷ = 15968789 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 (16099801) 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 3 ways as a sum of consecutive naturals, for example, 136381 + ... + 136498.

It is an arithmetic number, because the mean of its divisors is an integer number (4093200).

Almost surely, 2^16099861 is an apocalyptic number.

It is an amenable number.

16099861 is a deficient number, since it is larger than the sum of its proper divisors (272939).

16099861 is an equidigital number, since it uses as much as digits as its factorization.

16099861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272938.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 16099861 is about 4012.4632085541. The cubic root of 16099861 is about 252.5073605017.

The spelling of 16099861 in words is "sixteen million, ninety-nine thousand, eight hundred sixty-one".