16891393 has 2 divisors, whose sum is σ = 16891394. Its totient is φ = 16891392.

The previous prime is 16891379. The next prime is 16891411. The reversal of 16891393 is 39319861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14837904 + 2053489 = 3852^2 + 1433^2 .

It is a cyclic number.

It is not a de Polignac number, because 16891393 - 2¹³ = 16883201 is a prime.

It is not a weakly prime, because it can be changed into another prime (16891333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8445696 + 8445697.

It is an arithmetic number, because the mean of its divisors is an integer number (8445697).

Almost surely, 2^16891393 is an apocalyptic number.

It is an amenable number.

16891393 is a deficient number, since it is larger than the sum of its proper divisors (1).

16891393 is an equidigital number, since it uses as much as digits as its factorization.

16891393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 16891393 is about 4109.9139893677. The cubic root of 16891393 is about 256.5794218196.

The spelling of 16891393 in words is "sixteen million, eight hundred ninety-one thousand, three hundred ninety-three".