169207945 has 4 divisors (see below), whose sum is σ = 203049540. Its totient is φ = 135366352.

The previous prime is 169207933. The next prime is 169207949. The reversal of 169207945 is 549702961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549702961 = 12889 ⋅42649.

It can be written as a sum of positive squares in 2 ways, for example, as 24631369 + 144576576 = 4963^2 + 12024^2 .

It is a cyclic number.

It is not a de Polignac number, because 169207945 - 2¹⁹ = 168683657 is a prime.

It is a super-2 number, since 2×169207945² = 57262657302246050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (169207949) 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, 16920790 + ... + 16920799.

It is an arithmetic number, because the mean of its divisors is an integer number (50762385).

Almost surely, 2^169207945 is an apocalyptic number.

It is an amenable number.

169207945 is a deficient number, since it is larger than the sum of its proper divisors (33841595).

169207945 is an equidigital number, since it uses as much as digits as its factorization.

169207945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33841594.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 169207945 is about 13007.9954258910. The cubic root of 169207945 is about 553.1041499796.

The spelling of 169207945 in words is "one hundred sixty-nine million, two hundred seven thousand, nine hundred forty-five".