197318087 has 2 divisors, whose sum is σ = 197318088. Its totient is φ = 197318086.

The previous prime is 197318083. The next prime is 197318101. The reversal of 197318087 is 780813791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197318087 - 2² = 197318083 is a prime.

It is a Chen prime.

It is equal to p_10938779 and since 197318087 and 10938779 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197318083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98659043 + 98659044.

It is an arithmetic number, because the mean of its divisors is an integer number (98659044).

Almost surely, 2^197318087 is an apocalyptic number.

197318087 is a deficient number, since it is larger than the sum of its proper divisors (1).

197318087 is an equidigital number, since it uses as much as digits as its factorization.

197318087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 197318087 is about 14046.9956574351. The cubic root of 197318087 is about 582.1777886081.

The spelling of 197318087 in words is "one hundred ninety-seven million, three hundred eighteen thousand, eighty-seven".