101820197 has 2 divisors, whose sum is σ = 101820198. Its totient is φ = 101820196.

The previous prime is 101820139. The next prime is 101820209. The reversal of 101820197 is 791028101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91891396 + 9928801 = 9586^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 101820197 - 2⁸ = 101819941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101820127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50910098 + 50910099.

It is an arithmetic number, because the mean of its divisors is an integer number (50910099).

Almost surely, 2^101820197 is an apocalyptic number.

It is an amenable number.

101820197 is a deficient number, since it is larger than the sum of its proper divisors (1).

101820197 is an equidigital number, since it uses as much as digits as its factorization.

101820197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 101820197 is about 10090.5994370999. The cubic root of 101820197 is about 466.9581692926.

Adding to 101820197 its reverse (791028101), we get a palindrome (892848298).

The spelling of 101820197 in words is "one hundred one million, eight hundred twenty thousand, one hundred ninety-seven".