135581557 has 2 divisors, whose sum is σ = 135581558. Its totient is φ = 135581556.

The previous prime is 135581543. The next prime is 135581591. The reversal of 135581557 is 755185531.

135581557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87778161 + 47803396 = 9369^2 + 6914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135581557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135581597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67790778 + 67790779.

It is an arithmetic number, because the mean of its divisors is an integer number (67790779).

Almost surely, 2^135581557 is an apocalyptic number.

It is an amenable number.

135581557 is a deficient number, since it is larger than the sum of its proper divisors (1).

135581557 is an equidigital number, since it uses as much as digits as its factorization.

135581557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105000, while the sum is 40.

The square root of 135581557 is about 11643.9493729576. The cubic root of 135581557 is about 513.7283572754.

The spelling of 135581557 in words is "one hundred thirty-five million, five hundred eighty-one thousand, five hundred fifty-seven".