169228391 has 2 divisors, whose sum is σ = 169228392. Its totient is φ = 169228390.

The previous prime is 169228379. The next prime is 169228463. The reversal of 169228391 is 193822961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 169228391 - 2¹⁴ = 169212007 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 (169228321) 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, 84614195 + 84614196.

It is an arithmetic number, because the mean of its divisors is an integer number (84614196).

Almost surely, 2^169228391 is an apocalyptic number.

169228391 is a deficient number, since it is larger than the sum of its proper divisors (1).

169228391 is an equidigital number, since it uses as much as digits as its factorization.

169228391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 169228391 is about 13008.7813034119. The cubic root of 169228391 is about 553.1264269320.

The spelling of 169228391 in words is "one hundred sixty-nine million, two hundred twenty-eight thousand, three hundred ninety-one".