195124289 has 4 divisors (see below), whose sum is σ = 199883460. Its totient is φ = 190365120.

The previous prime is 195124277. The next prime is 195124297. The reversal of 195124289 is 982421591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50523664 + 144600625 = 7108^2 + 12025^2 .

It is a cyclic number.

It is not a de Polignac number, because 195124289 - 2¹² = 195120193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 4759129 = 195124289 / (1 + 9 + 5 + 1 + 2 + 4 + 2 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195114289) 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, 2379524 + ... + 2379605.

It is an arithmetic number, because the mean of its divisors is an integer number (49970865).

Almost surely, 2^195124289 is an apocalyptic number.

It is an amenable number.

195124289 is a deficient number, since it is larger than the sum of its proper divisors (4759171).

195124289 is an equidigital number, since it uses as much as digits as its factorization.

195124289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4759170.

The product of its digits is 51840, while the sum is 41.

The square root of 195124289 is about 13968.6895949477. The cubic root of 195124289 is about 580.0121767162.

The spelling of 195124289 in words is "one hundred ninety-five million, one hundred twenty-four thousand, two hundred eighty-nine".