169681943 has 2 divisors, whose sum is σ = 169681944. Its totient is φ = 169681942.

The previous prime is 169681909. The next prime is 169681961. The reversal of 169681943 is 349186961.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169681943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169681243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84840971 + 84840972.

It is an arithmetic number, because the mean of its divisors is an integer number (84840972).

Almost surely, 2^169681943 is an apocalyptic number.

169681943 is a deficient number, since it is larger than the sum of its proper divisors (1).

169681943 is an equidigital number, since it uses as much as digits as its factorization.

169681943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 169681943 is about 13026.2021710090. The cubic root of 169681943 is about 553.6201340990.

The spelling of 169681943 in words is "one hundred sixty-nine million, six hundred eighty-one thousand, nine hundred forty-three".