195565129 has 4 divisors (see below), whose sum is σ = 197762580. Its totient is φ = 193367680.

The previous prime is 195565109. The next prime is 195565147. The reversal of 195565129 is 921565591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921565591 = 433 ⋅2128327.

It can be written as a sum of positive squares in 2 ways, for example, as 97555129 + 98010000 = 9877^2 + 9900^2 .

It is a cyclic number.

It is not a de Polignac number, because 195565129 - 2⁷ = 195565001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195565109) 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, 1098592 + ... + 1098769.

It is an arithmetic number, because the mean of its divisors is an integer number (49440645).

Almost surely, 2^195565129 is an apocalyptic number.

It is an amenable number.

195565129 is a deficient number, since it is larger than the sum of its proper divisors (2197451).

195565129 is an equidigital number, since it uses as much as digits as its factorization.

195565129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197450.

The product of its digits is 121500, while the sum is 43.

The square root of 195565129 is about 13984.4602684551. The cubic root of 195565129 is about 580.4486510790.

The spelling of 195565129 in words is "one hundred ninety-five million, five hundred sixty-five thousand, one hundred twenty-nine".