135192538681 has 2 divisors, whose sum is σ = 135192538682. Its totient is φ = 135192538680.

The previous prime is 135192538619. The next prime is 135192538727. The reversal of 135192538681 is 186835291531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113490829456 + 21701709225 = 336884^2 + 147315^2 .

It is a cyclic number.

It is not a de Polignac number, because 135192538681 - 2¹³ = 135192530489 is a prime.

It is a super-2 number, since 2×135192538681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135192538181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67596269340 + 67596269341.

It is an arithmetic number, because the mean of its divisors is an integer number (67596269341).

Almost surely, 2^135192538681 is an apocalyptic number.

It is an amenable number.

135192538681 is a deficient number, since it is larger than the sum of its proper divisors (1).

135192538681 is an equidigital number, since it uses as much as digits as its factorization.

135192538681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 52.

The spelling of 135192538681 in words is "one hundred thirty-five billion, one hundred ninety-two million, five hundred thirty-eight thousand, six hundred eighty-one".