169381997 has 2 divisors, whose sum is σ = 169381998. Its totient is φ = 169381996.

The previous prime is 169381991. The next prime is 169382039. The reversal of 169381997 is 799183961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133033156 + 36348841 = 11534^2 + 6029^2 .

It is a cyclic number.

It is not a de Polignac number, because 169381997 - 2⁸ = 169381741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169381991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84690998 + 84690999.

It is an arithmetic number, because the mean of its divisors is an integer number (84690999).

Almost surely, 2^169381997 is an apocalyptic number.

It is an amenable number.

169381997 is a deficient number, since it is larger than the sum of its proper divisors (1).

169381997 is an equidigital number, since it uses as much as digits as its factorization.

169381997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The square root of 169381997 is about 13014.6838993500. The cubic root of 169381997 is about 553.2937310974.

The spelling of 169381997 in words is "one hundred sixty-nine million, three hundred eighty-one thousand, nine hundred ninety-seven".