169159561 has 8 divisors (see below), whose sum is σ = 172970784. Its totient is φ = 165390720.

The previous prime is 169159499. The next prime is 169159567. The reversal of 169159561 is 165951961.

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 169159561 - 2¹³ = 169151369 is a prime.

It is a super-2 number, since 2×169159561² = 57229914155425442, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (169159567) 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, 2455 + ... + 18556.

It is an arithmetic number, because the mean of its divisors is an integer number (21621348).

Almost surely, 2^169159561 is an apocalyptic number.

It is an amenable number.

169159561 is a deficient number, since it is larger than the sum of its proper divisors (3811223).

169159561 is an equidigital number, since it uses as much as digits as its factorization.

169159561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21191.

The product of its digits is 72900, while the sum is 43.

The square root of 169159561 is about 13006.1355136720. The cubic root of 169159561 is about 553.0514260125.

The spelling of 169159561 in words is "one hundred sixty-nine million, one hundred fifty-nine thousand, five hundred sixty-one".