197395813 has 2 divisors, whose sum is σ = 197395814. Its totient is φ = 197395812.

The previous prime is 197395801. The next prime is 197395819. The reversal of 197395813 is 318593791.

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., 183385764 + 14010049 = 13542^2 + 3743^2 .

It is a cyclic number.

It is not a de Polignac number, because 197395813 - 2⁹ = 197395301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197395819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98697906 + 98697907.

It is an arithmetic number, because the mean of its divisors is an integer number (98697907).

Almost surely, 2^197395813 is an apocalyptic number.

It is an amenable number.

197395813 is a deficient number, since it is larger than the sum of its proper divisors (1).

197395813 is an equidigital number, since it uses as much as digits as its factorization.

197395813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The square root of 197395813 is about 14049.7620264544. The cubic root of 197395813 is about 582.2542208825.

It can be divided in two parts, 19739 and 5813, that added together give a palindrome (25552).

The spelling of 197395813 in words is "one hundred ninety-seven million, three hundred ninety-five thousand, eight hundred thirteen".