195120857 has 2 divisors, whose sum is σ = 195120858. Its totient is φ = 195120856.

The previous prime is 195120853. The next prime is 195120889. The reversal of 195120857 is 758021591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127486681 + 67634176 = 11291^2 + 8224^2 .

It is a cyclic number.

It is not a de Polignac number, because 195120857 - 2² = 195120853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195120857.

It is not a weakly prime, because it can be changed into another prime (195120853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97560428 + 97560429.

It is an arithmetic number, because the mean of its divisors is an integer number (97560429).

Almost surely, 2^195120857 is an apocalyptic number.

It is an amenable number.

195120857 is a deficient number, since it is larger than the sum of its proper divisors (1).

195120857 is an equidigital number, since it uses as much as digits as its factorization.

195120857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 195120857 is about 13968.5667482387. The cubic root of 195120857 is about 580.0087761256.

The spelling of 195120857 in words is "one hundred ninety-five million, one hundred twenty thousand, eight hundred fifty-seven".