169611997 has 2 divisors, whose sum is σ = 169611998. Its totient is φ = 169611996.

The previous prime is 169611991. The next prime is 169612007. The reversal of 169611997 is 799116961.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145660761 + 23951236 = 12069^2 + 4894^2 .

It is a cyclic number.

It is not a de Polignac number, because 169611997 - 2³ = 169611989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169611997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169611991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84805998 + 84805999.

It is an arithmetic number, because the mean of its divisors is an integer number (84805999).

Almost surely, 2^169611997 is an apocalyptic number.

It is an amenable number.

169611997 is a deficient number, since it is larger than the sum of its proper divisors (1).

169611997 is an equidigital number, since it uses as much as digits as its factorization.

169611997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 49.

The square root of 169611997 is about 13023.5170748919. The cubic root of 169611997 is about 553.5440528628.

The spelling of 169611997 in words is "one hundred sixty-nine million, six hundred eleven thousand, nine hundred ninety-seven".