197813893 has 2 divisors, whose sum is σ = 197813894. Its totient is φ = 197813892.

The previous prime is 197813879. The next prime is 197813897. The reversal of 197813893 is 398318791.

197813893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166978084 + 30835809 = 12922^2 + 5553^2 .

It is a cyclic number.

It is not a de Polignac number, because 197813893 - 2⁹ = 197813381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197813897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98906946 + 98906947.

It is an arithmetic number, because the mean of its divisors is an integer number (98906947).

Almost surely, 2^197813893 is an apocalyptic number.

It is an amenable number.

197813893 is a deficient number, since it is larger than the sum of its proper divisors (1).

197813893 is an equidigital number, since it uses as much as digits as its factorization.

197813893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 197813893 is about 14064.6327005009. The cubic root of 197813893 is about 582.6649982337.

The spelling of 197813893 in words is "one hundred ninety-seven million, eight hundred thirteen thousand, eight hundred ninety-three".