195121577 has 6 divisors (see below), whose sum is σ = 226978218. Its totient is φ = 167247024.

The previous prime is 195121559. The next prime is 195121603. The reversal of 195121577 is 775121591.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 193655056 + 1466521 = 13916^2 + 1211^2 .

It is not a de Polignac number, because 195121577 - 2⁸ = 195121321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 195121577.

It is not an unprimeable number, because it can be changed into a prime (195121777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1990988 + ... + 1991085.

It is an arithmetic number, because the mean of its divisors is an integer number (37829703).

Almost surely, 2^195121577 is an apocalyptic number.

It is an amenable number.

195121577 is a deficient number, since it is larger than the sum of its proper divisors (31856641).

195121577 is an equidigital number, since it uses as much as digits as its factorization.

195121577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982087 (or 3982080 counting only the distinct ones).

The product of its digits is 22050, while the sum is 38.

The square root of 195121577 is about 13968.5925203651. The cubic root of 195121577 is about 580.0094895395.

The spelling of 195121577 in words is "one hundred ninety-five million, one hundred twenty-one thousand, five hundred seventy-seven".