169121441 has 2 divisors, whose sum is σ = 169121442. Its totient is φ = 169121440.

The previous prime is 169121429. The next prime is 169121443. The reversal of 169121441 is 144121961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166513216 + 2608225 = 12904^2 + 1615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169121441 is a prime.

Together with 169121443, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (169121443) 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, 84560720 + 84560721.

It is an arithmetic number, because the mean of its divisors is an integer number (84560721).

Almost surely, 2^169121441 is an apocalyptic number.

It is an amenable number.

169121441 is a deficient number, since it is larger than the sum of its proper divisors (1).

169121441 is an equidigital number, since it uses as much as digits as its factorization.

169121441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 169121441 is about 13004.6699688996. The cubic root of 169121441 is about 553.0098796286.

It can be divided in two parts, 1691 and 21441, that added together give a palindrome (23132).

The spelling of 169121441 in words is "one hundred sixty-nine million, one hundred twenty-one thousand, four hundred forty-one".