195212657 has 2 divisors, whose sum is σ = 195212658. Its totient is φ = 195212656.

The previous prime is 195212623. The next prime is 195212671. The reversal of 195212657 is 756212591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187169761 + 8042896 = 13681^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 195212657 - 2¹² = 195208561 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195212657.

It is not a weakly prime, because it can be changed into another prime (195212617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97606328 + 97606329.

It is an arithmetic number, because the mean of its divisors is an integer number (97606329).

Almost surely, 2^195212657 is an apocalyptic number.

It is an amenable number.

195212657 is a deficient number, since it is larger than the sum of its proper divisors (1).

195212657 is an equidigital number, since it uses as much as digits as its factorization.

195212657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 195212657 is about 13971.8523109858. The cubic root of 195212657 is about 580.0997222508.

The spelling of 195212657 in words is "one hundred ninety-five million, two hundred twelve thousand, six hundred fifty-seven".