135553591 has 2 divisors, whose sum is σ = 135553592. Its totient is φ = 135553590.

The previous prime is 135553567. The next prime is 135553601. The reversal of 135553591 is 195355531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135553591 - 2⁷ = 135553463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135553591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135553531) 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 as a sum of consecutive naturals, namely, 67776795 + 67776796.

It is an arithmetic number, because the mean of its divisors is an integer number (67776796).

Almost surely, 2^135553591 is an apocalyptic number.

135553591 is a deficient number, since it is larger than the sum of its proper divisors (1).

135553591 is an equidigital number, since it uses as much as digits as its factorization.

135553591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50625, while the sum is 37.

The square root of 135553591 is about 11642.7484298167. The cubic root of 135553591 is about 513.6930331122.

It can be divided in two parts, 1355 and 53591, that added together give a triangular number (54946 = T₃₃₁).

The spelling of 135553591 in words is "one hundred thirty-five million, five hundred fifty-three thousand, five hundred ninety-one".