169128643 has 2 divisors, whose sum is σ = 169128644. Its totient is φ = 169128642.

The previous prime is 169128629. The next prime is 169128677. The reversal of 169128643 is 346821961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 169128643 - 2²⁵ = 135574211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 169128596 and 169128605.

It is not a weakly prime, because it can be changed into another prime (169120643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84564321 + 84564322.

It is an arithmetic number, because the mean of its divisors is an integer number (84564322).

Almost surely, 2^169128643 is an apocalyptic number.

169128643 is a deficient number, since it is larger than the sum of its proper divisors (1).

169128643 is an equidigital number, since it uses as much as digits as its factorization.

169128643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 169128643 is about 13004.9468664812. The cubic root of 169128643 is about 553.0177294526.

The spelling of 169128643 in words is "one hundred sixty-nine million, one hundred twenty-eight thousand, six hundred forty-three".