135087981817 has 2 divisors, whose sum is σ = 135087981818. Its totient is φ = 135087981816.

The previous prime is 135087981781. The next prime is 135087981851. The reversal of 135087981817 is 718189780531.

Together with previous prime (135087981781) 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., 102202335481 + 32885646336 = 319691^2 + 181344^2 .

It is an emirp because it is prime and its reverse (718189780531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135087981817 - 2¹⁵ = 135087949049 is a prime.

It is not a weakly prime, because it can be changed into another prime (135087981617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67543990908 + 67543990909.

It is an arithmetic number, because the mean of its divisors is an integer number (67543990909).

Almost surely, 2^135087981817 is an apocalyptic number.

It is an amenable number.

135087981817 is a deficient number, since it is larger than the sum of its proper divisors (1).

135087981817 is an equidigital number, since it uses as much as digits as its factorization.

135087981817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 58.

The spelling of 135087981817 in words is "one hundred thirty-five billion, eighty-seven million, nine hundred eighty-one thousand, eight hundred seventeen".