16051993 has 4 divisors (see below), whose sum is σ = 16605540. Its totient is φ = 15498448.

The previous prime is 16051991. The next prime is 16052027. The reversal of 16051993 is 39915061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12411529 + 3640464 = 3523^2 + 1908^2 .

It is a cyclic number.

It is not a de Polignac number, because 16051993 - 2¹ = 16051991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16051991) 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, 276730 + ... + 276787.

It is an arithmetic number, because the mean of its divisors is an integer number (4151385).

Almost surely, 2^16051993 is an apocalyptic number.

It is an amenable number.

16051993 is a deficient number, since it is larger than the sum of its proper divisors (553547).

16051993 is an equidigital number, since it uses as much as digits as its factorization.

16051993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553546.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 16051993 is about 4006.4938537330. The cubic root of 16051993 is about 252.2568610062.

The spelling of 16051993 in words is "sixteen million, fifty-one thousand, nine hundred ninety-three".