169555961 has 2 divisors, whose sum is σ = 169555962. Its totient is φ = 169555960.

The previous prime is 169555949. The next prime is 169555973.

169555961 is nontrivially palindromic in base 10.

It is a balanced prime because it is at equal distance from previous prime (169555949) and next prime (169555973).

It can be written as a sum of positive squares in only one way, i.e., 150798400 + 18757561 = 12280^2 + 4331^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 169555961 - 2¹⁰ = 169554937 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (169555901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84777980 + 84777981.

It is an arithmetic number, because the mean of its divisors is an integer number (84777981).

Almost surely, 2^169555961 is an apocalyptic number.

It is an amenable number.

169555961 is a deficient number, since it is larger than the sum of its proper divisors (1).

169555961 is an equidigital number, since it uses as much as digits as its factorization.

169555961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364500, while the sum is 47.

The square root of 169555961 is about 13021.3655581894. The cubic root of 169555961 is about 553.4830866346.

The spelling of 169555961 in words is "one hundred sixty-nine million, five hundred fifty-five thousand, nine hundred sixty-one".