169812961 has 4 divisors (see below), whose sum is σ = 169839124. Its totient is φ = 169786800.

The previous prime is 169812931. The next prime is 169812967. The reversal of 169812961 is 169218961.

169812961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169218961 = 2179 ⋅77659.

It can be written as a sum of positive squares in 2 ways, for example, as 79923600 + 89889361 = 8940^2 + 9481^2 .

It is a cyclic number.

It is not a de Polignac number, because 169812961 - 2⁹ = 169812449 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169812967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4831 + ... + 19051.

It is an arithmetic number, because the mean of its divisors is an integer number (42459781).

Almost surely, 2^169812961 is an apocalyptic number.

It is an amenable number.

169812961 is a deficient number, since it is larger than the sum of its proper divisors (26163).

169812961 is a wasteful number, since it uses less digits than its factorization.

169812961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26162.

The product of its digits is 46656, while the sum is 43.

The square root of 169812961 is about 13031.2302182104. The cubic root of 169812961 is about 553.7625879563.

The spelling of 169812961 in words is "one hundred sixty-nine million, eight hundred twelve thousand, nine hundred sixty-one".