197918101 has 2 divisors, whose sum is σ = 197918102. Its totient is φ = 197918100.

The previous prime is 197918093. The next prime is 197918107. The reversal of 197918101 is 101819791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155002500 + 42915601 = 12450^2 + 6551^2 .

It is an emirp because it is prime and its reverse (101819791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197918101 - 2³ = 197918093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197918107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98959050 + 98959051.

It is an arithmetic number, because the mean of its divisors is an integer number (98959051).

Almost surely, 2^197918101 is an apocalyptic number.

It is an amenable number.

197918101 is a deficient number, since it is larger than the sum of its proper divisors (1).

197918101 is an equidigital number, since it uses as much as digits as its factorization.

197918101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 37.

The square root of 197918101 is about 14068.3368242305. The cubic root of 197918101 is about 582.7672958938.

The spelling of 197918101 in words is "one hundred ninety-seven million, nine hundred eighteen thousand, one hundred one".