135521441 has 8 divisors (see below), whose sum is σ = 151447968. Its totient is φ = 120196000.

The previous prime is 135521431. The next prime is 135521447. The reversal of 135521441 is 144125531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135521441 - 2⁶ = 135521377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135521441.

It is not an unprimeable number, because it can be changed into a prime (135521447) 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 7 ways as a sum of consecutive naturals, for example, 149795 + ... + 150696.

It is an arithmetic number, because the mean of its divisors is an integer number (18930996).

Almost surely, 2^135521441 is an apocalyptic number.

135521441 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135521441 is a deficient number, since it is larger than the sum of its proper divisors (15926527).

135521441 is a wasteful number, since it uses less digits than its factorization.

135521441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300543.

The product of its digits is 2400, while the sum is 26.

The square root of 135521441 is about 11641.3676602021. The cubic root of 135521441 is about 513.6524180887.

Adding to 135521441 its reverse (144125531), we get a palindrome (279646972).

The spelling of 135521441 in words is "one hundred thirty-five million, five hundred twenty-one thousand, four hundred forty-one".