16006993 has 2 divisors, whose sum is σ = 16006994. Its totient is φ = 16006992.

The previous prime is 16006981. The next prime is 16006997. The reversal of 16006993 is 39960061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15147664 + 859329 = 3892^2 + 927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16006993 is a prime.

16006993 is a modest number, since divided by 6993 gives 16 as remainder.

It is not a weakly prime, because it can be changed into another prime (16006997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8003496 + 8003497.

It is an arithmetic number, because the mean of its divisors is an integer number (8003497).

Almost surely, 2^16006993 is an apocalyptic number.

It is an amenable number.

16006993 is a deficient number, since it is larger than the sum of its proper divisors (1).

16006993 is an equidigital number, since it uses as much as digits as its factorization.

16006993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 16006993 is about 4000.8740295091. The cubic root of 16006993 is about 252.0209155815.

The spelling of 16006993 in words is "sixteen million, six thousand, nine hundred ninety-three".