169638901 has 2 divisors, whose sum is σ = 169638902. Its totient is φ = 169638900.

The previous prime is 169638881. The next prime is 169638929. The reversal of 169638901 is 109836961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120428676 + 49210225 = 10974^2 + 7015^2 .

It is a cyclic number.

It is not a de Polignac number, because 169638901 - 2⁷ = 169638773 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169638101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84819450 + 84819451.

It is an arithmetic number, because the mean of its divisors is an integer number (84819451).

Almost surely, 2^169638901 is an apocalyptic number.

It is an amenable number.

169638901 is a deficient number, since it is larger than the sum of its proper divisors (1).

169638901 is an equidigital number, since it uses as much as digits as its factorization.

169638901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 169638901 is about 13024.5499346427. The cubic root of 169638901 is about 553.5733191924.

The spelling of 169638901 in words is "one hundred sixty-nine million, six hundred thirty-eight thousand, nine hundred one".