169965961 has 16 divisors (see below), whose sum is σ = 189331200. Its totient is φ = 151275600.

The previous prime is 169965937. The next prime is 169965979. The reversal of 169965961 is 169569961.

It is a cyclic number.

It is not a de Polignac number, because 169965961 - 2¹⁹ = 169441673 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 = 169965899 and 169965908.

It is not an unprimeable number, because it can be changed into a prime (169965661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245626 + ... + 246316.

It is an arithmetic number, because the mean of its divisors is an integer number (11833200).

Almost surely, 2^169965961 is an apocalyptic number.

169965961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

169965961 is a deficient number, since it is larger than the sum of its proper divisors (19365239).

169965961 is a wasteful number, since it uses less digits than its factorization.

169965961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140.

The product of its digits is 787320, while the sum is 52.

The square root of 169965961 is about 13037.0994089943. The cubic root of 169965961 is about 553.9288497903.

The spelling of 169965961 in words is "one hundred sixty-nine million, nine hundred sixty-five thousand, nine hundred sixty-one".