195191945 has 8 divisors (see below), whose sum is σ = 252248136. Its totient is φ = 144141696.

The previous prime is 195191897. The next prime is 195191947. The reversal of 195191945 is 549191591.

It can be written as a sum of positive squares in 4 ways, for example, as 226576 + 194965369 = 476^2 + 13963^2 .

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 195191945 - 2⁶ = 195191881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 195191896 and 195191905.

It is not an unprimeable number, because it can be changed into a prime (195191947) 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, 1501412 + ... + 1501541.

It is an arithmetic number, because the mean of its divisors is an integer number (31531017).

Almost surely, 2^195191945 is an apocalyptic number.

It is an amenable number.

195191945 is a deficient number, since it is larger than the sum of its proper divisors (57056191).

195191945 is a wasteful number, since it uses less digits than its factorization.

195191945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002971.

The product of its digits is 72900, while the sum is 44.

The square root of 195191945 is about 13971.1110868105. Note that the first 3 decimals coincide. The cubic root of 195191945 is about 580.0792053940.

The spelling of 195191945 in words is "one hundred ninety-five million, one hundred ninety-one thousand, nine hundred forty-five".