195313615249 has 9 divisors (see below), whose sum is σ = 197107748539. Its totient is φ = 193535678560.

The previous prime is 195313615241. The next prime is 195313615253. The reversal of 195313615249 is 942516313591.

The square root of 195313615249 is 441943.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3441582225 + 191872033024 = 58665^2 + 438032^2 .

It is not a de Polignac number, because 195313615249 - 2³ = 195313615241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195313615241) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 49937604 + ... + 49941514.

Almost surely, 2^195313615249 is an apocalyptic number.

195313615249 is the 441943-rd square number.

195313615249 is the 220972-nd centered octagonal number.

It is an amenable number.

195313615249 is a deficient number, since it is larger than the sum of its proper divisors (1794133290).

195313615249 is an frugal number, since it uses more digits than its factorization.

195313615249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8048 (or 4024 counting only the distinct ones).

The product of its digits is 874800, while the sum is 49.

Multiplying 195313615249 by its sum of digits (49), we get a square (9570367147201 = 3093601²).

The spelling of 195313615249 in words is "one hundred ninety-five billion, three hundred thirteen million, six hundred fifteen thousand, two hundred forty-nine".