193865897 has 2 divisors, whose sum is σ = 193865898. Its totient is φ = 193865896.

The previous prime is 193865857. The next prime is 193865923. The reversal of 193865897 is 798568391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130965136 + 62900761 = 11444^2 + 7931^2 .

It is a cyclic number.

It is not a de Polignac number, because 193865897 - 2²⁰ = 192817321 is a prime.

It is a super-2 number, since 2×193865897² = 75167972039229218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (193865857) 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 as a sum of consecutive naturals, namely, 96932948 + 96932949.

It is an arithmetic number, because the mean of its divisors is an integer number (96932949).

Almost surely, 2^193865897 is an apocalyptic number.

It is an amenable number.

193865897 is a deficient number, since it is larger than the sum of its proper divisors (1).

193865897 is an equidigital number, since it uses as much as digits as its factorization.

193865897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 56.

The square root of 193865897 is about 13923.5734278238. The cubic root of 193865897 is about 578.7626186670.

The spelling of 193865897 in words is "one hundred ninety-three million, eight hundred sixty-five thousand, eight hundred ninety-seven".