135561613081 has 4 divisors (see below), whose sum is σ = 137859267600. Its totient is φ = 133263958564.

The previous prime is 135561613069. The next prime is 135561613093. The reversal of 135561613081 is 180316165531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (135561613069) and next prime (135561613093).

It is a cyclic number.

It is not a de Polignac number, because 135561613081 - 2²⁷ = 135427395353 is a prime.

It is a super-2 number, since 2×135561613081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135561613021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148827171 + ... + 1148827288.

It is an arithmetic number, because the mean of its divisors is an integer number (34464816900).

Almost surely, 2^135561613081 is an apocalyptic number.

It is an amenable number.

135561613081 is a deficient number, since it is larger than the sum of its proper divisors (2297654519).

135561613081 is an equidigital number, since it uses as much as digits as its factorization.

135561613081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297654518.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 135561613081 in words is "one hundred thirty-five billion, five hundred sixty-one million, six hundred thirteen thousand, eighty-one".