135999197 has 2 divisors, whose sum is σ = 135999198. Its totient is φ = 135999196.

The previous prime is 135999179. The next prime is 135999203. The reversal of 135999197 is 791999531.

It is a happy number.

Together with previous prime (135999179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101082916 + 34916281 = 10054^2 + 5909^2 .

It is a cyclic number.

It is not a de Polignac number, because 135999197 - 2¹⁶ = 135933661 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 (135999107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67999598 + 67999599.

It is an arithmetic number, because the mean of its divisors is an integer number (67999599).

Almost surely, 2^135999197 is an apocalyptic number.

It is an amenable number.

135999197 is a deficient number, since it is larger than the sum of its proper divisors (1).

135999197 is an equidigital number, since it uses as much as digits as its factorization.

135999197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 688905, while the sum is 53.

The square root of 135999197 is about 11661.8693612988. The cubic root of 135999197 is about 514.2553060026.

The spelling of 135999197 in words is "one hundred thirty-five million, nine hundred ninety-nine thousand, one hundred ninety-seven".