135521439197 has 2 divisors, whose sum is σ = 135521439198. Its totient is φ = 135521439196.

The previous prime is 135521439187. The next prime is 135521439217. The reversal of 135521439197 is 791934125531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92909745721 + 42611693476 = 304811^2 + 206426^2 .

It is a cyclic number.

It is not a de Polignac number, because 135521439197 - 2⁴ = 135521439181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135521439107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67760719598 + 67760719599.

It is an arithmetic number, because the mean of its divisors is an integer number (67760719599).

Almost surely, 2^135521439197 is an apocalyptic number.

It is an amenable number.

135521439197 is a deficient number, since it is larger than the sum of its proper divisors (1).

135521439197 is an equidigital number, since it uses as much as digits as its factorization.

135521439197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 50.

The spelling of 135521439197 in words is "one hundred thirty-five billion, five hundred twenty-one million, four hundred thirty-nine thousand, one hundred ninety-seven".