195116021 has 4 divisors (see below), whose sum is σ = 206593452. Its totient is φ = 183638592.

The previous prime is 195115979. The next prime is 195116039. The reversal of 195116021 is 120611591.

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 88096996 + 107019025 = 9386^2 + 10345^2 .

It is a cyclic number.

It is not a de Polignac number, because 195116021 - 2⁶ = 195115957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195116041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5738690 + ... + 5738723.

It is an arithmetic number, because the mean of its divisors is an integer number (51648363).

Almost surely, 2^195116021 is an apocalyptic number.

It is an amenable number.

195116021 is a deficient number, since it is larger than the sum of its proper divisors (11477431).

195116021 is a wasteful number, since it uses less digits than its factorization.

195116021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11477430.

The product of its (nonzero) digits is 540, while the sum is 26.

The square root of 195116021 is about 13968.3936442241. The cubic root of 195116021 is about 580.0039843167.

The spelling of 195116021 in words is "one hundred ninety-five million, one hundred sixteen thousand, twenty-one".