16689791 has 2 divisors, whose sum is σ = 16689792. Its totient is φ = 16689790.

The previous prime is 16689787. The next prime is 16689817. The reversal of 16689791 is 19798661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16689791 - 2² = 16689787 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16689731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344895 + 8344896.

It is an arithmetic number, because the mean of its divisors is an integer number (8344896).

Almost surely, 2^16689791 is an apocalyptic number.

16689791 is a deficient number, since it is larger than the sum of its proper divisors (1).

16689791 is an equidigital number, since it uses as much as digits as its factorization.

16689791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 16689791 is about 4085.3140638144. The cubic root of 16689791 is about 255.5545588353.

The spelling of 16689791 in words is "sixteen million, six hundred eighty-nine thousand, seven hundred ninety-one".