135180581 has 4 divisors (see below), whose sum is σ = 137731212. Its totient is φ = 132629952.

The previous prime is 135180569. The next prime is 135180589. The reversal of 135180581 is 185081531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38551681 + 96628900 = 6209^2 + 9830^2 .

It is a cyclic number.

It is not a de Polignac number, because 135180581 - 2⁶ = 135180517 is a prime.

It is a super-2 number, since 2×135180581² = 36547578958995122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135180589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1275236 + ... + 1275341.

It is an arithmetic number, because the mean of its divisors is an integer number (34432803).

Almost surely, 2^135180581 is an apocalyptic number.

It is an amenable number.

135180581 is a deficient number, since it is larger than the sum of its proper divisors (2550631).

135180581 is an equidigital number, since it uses as much as digits as its factorization.

135180581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550630.

The product of its (nonzero) digits is 4800, while the sum is 32.

The square root of 135180581 is about 11626.7184106264. The cubic root of 135180581 is about 513.2214148075.

The spelling of 135180581 in words is "one hundred thirty-five million, one hundred eighty thousand, five hundred eighty-one".