169905161 has 2 divisors, whose sum is σ = 169905162. Its totient is φ = 169905160.

The previous prime is 169905143. The next prime is 169905173. The reversal of 169905161 is 161509961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111091600 + 58813561 = 10540^2 + 7669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169905161 is a prime.

It is equal to p_9498125 and since 169905161 and 9498125 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (169905181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84952580 + 84952581.

It is an arithmetic number, because the mean of its divisors is an integer number (84952581).

Almost surely, 2^169905161 is an apocalyptic number.

It is an amenable number.

169905161 is a deficient number, since it is larger than the sum of its proper divisors (1).

169905161 is an equidigital number, since it uses as much as digits as its factorization.

169905161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 169905161 is about 13034.7673933983. The cubic root of 169905161 is about 553.8627916798.

The spelling of 169905161 in words is "one hundred sixty-nine million, nine hundred five thousand, one hundred sixty-one".