135521439187 has 2 divisors, whose sum is σ = 135521439188. Its totient is φ = 135521439186.

The previous prime is 135521439181. The next prime is 135521439197. The reversal of 135521439187 is 781934125531.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135521439187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135521439187.

It is not a weakly prime, because it can be changed into another prime (135521439181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67760719593 + 67760719594.

It is an arithmetic number, because the mean of its divisors is an integer number (67760719594).

Almost surely, 2^135521439187 is an apocalyptic number.

135521439187 is a deficient number, since it is larger than the sum of its proper divisors (1).

135521439187 is an equidigital number, since it uses as much as digits as its factorization.

135521439187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The spelling of 135521439187 in words is "one hundred thirty-five billion, five hundred twenty-one million, four hundred thirty-nine thousand, one hundred eighty-seven".