195820657 has 2 divisors, whose sum is σ = 195820658. Its totient is φ = 195820656.

The previous prime is 195820621. The next prime is 195820661. The reversal of 195820657 is 756028591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185068816 + 10751841 = 13604^2 + 3279^2 .

It is an emirp because it is prime and its reverse (756028591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195820657 - 2¹⁹ = 195296369 is a prime.

It is not a weakly prime, because it can be changed into another prime (195820607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97910328 + 97910329.

It is an arithmetic number, because the mean of its divisors is an integer number (97910329).

Almost surely, 2^195820657 is an apocalyptic number.

It is an amenable number.

195820657 is a deficient number, since it is larger than the sum of its proper divisors (1).

195820657 is an equidigital number, since it uses as much as digits as its factorization.

195820657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 195820657 is about 13993.5934269937. The cubic root of 195820657 is about 580.7013483623.

The spelling of 195820657 in words is "one hundred ninety-five million, eight hundred twenty thousand, six hundred fifty-seven".