16691293 has 2 divisors, whose sum is σ = 16691294. Its totient is φ = 16691292.

The previous prime is 16691281. The next prime is 16691303. The reversal of 16691293 is 39219661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12517444 + 4173849 = 3538^2 + 2043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16691293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16691243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8345646 + 8345647.

It is an arithmetic number, because the mean of its divisors is an integer number (8345647).

Almost surely, 2^16691293 is an apocalyptic number.

It is an amenable number.

16691293 is a deficient number, since it is larger than the sum of its proper divisors (1).

16691293 is an equidigital number, since it uses as much as digits as its factorization.

16691293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 16691293 is about 4085.4978888747. The cubic root of 16691293 is about 255.5622248277.

The spelling of 16691293 in words is "sixteen million, six hundred ninety-one thousand, two hundred ninety-three".