169736561 has 8 divisors (see below), whose sum is σ = 172588320. Its totient is φ = 166908448.

The previous prime is 169736537. The next prime is 169736591. The reversal of 169736561 is 165637961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 169736561 - 2¹⁰ = 169735537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169736521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8870 + ... + 20448.

It is an arithmetic number, because the mean of its divisors is an integer number (21573540).

Almost surely, 2^169736561 is an apocalyptic number.

It is an amenable number.

169736561 is a deficient number, since it is larger than the sum of its proper divisors (2851759).

169736561 is a wasteful number, since it uses less digits than its factorization.

169736561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11823.

The product of its digits is 204120, while the sum is 44.

The square root of 169736561 is about 13028.2984691018. The cubic root of 169736561 is about 553.6795283205.

The spelling of 169736561 in words is "one hundred sixty-nine million, seven hundred thirty-six thousand, five hundred sixty-one".