169929961 has 4 divisors (see below), whose sum is σ = 169956052. Its totient is φ = 169903872.

The previous prime is 169929913. The next prime is 169929979.

169929961 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 168091225 + 1838736 = 12965^2 + 1356^2 .

It is a cyclic number.

It is not a de Polignac number, because 169929961 - 2²⁷ = 35712233 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 169929899 and 169929908.

It is not an unprimeable number, because it can be changed into a prime (169923961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5785 + ... + 19321.

It is an arithmetic number, because the mean of its divisors is an integer number (42489013).

Almost surely, 2^169929961 is an apocalyptic number.

It is an amenable number.

169929961 is a deficient number, since it is larger than the sum of its proper divisors (26091).

169929961 is a wasteful number, since it uses less digits than its factorization.

169929961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26090.

The product of its digits is 472392, while the sum is 52.

The square root of 169929961 is about 13035.7186606646. The cubic root of 169929961 is about 553.8897383381.

The spelling of 169929961 in words is "one hundred sixty-nine million, nine hundred twenty-nine thousand, nine hundred sixty-one".