169841921 has 2 divisors, whose sum is σ = 169841922. Its totient is φ = 169841920.

The previous prime is 169841857. The next prime is 169841927. The reversal of 169841921 is 129148961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155127025 + 14714896 = 12455^2 + 3836^2 .

It is a cyclic number.

It is not a de Polignac number, because 169841921 - 2⁶ = 169841857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (169841927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84920960 + 84920961.

It is an arithmetic number, because the mean of its divisors is an integer number (84920961).

Almost surely, 2^169841921 is an apocalyptic number.

It is an amenable number.

169841921 is a deficient number, since it is larger than the sum of its proper divisors (1).

169841921 is an equidigital number, since it uses as much as digits as its factorization.

169841921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 169841921 is about 13032.3413475860. The cubic root of 169841921 is about 553.7940658304.

The spelling of 169841921 in words is "one hundred sixty-nine million, eight hundred forty-one thousand, nine hundred twenty-one".