135521057 has 8 divisors (see below), whose sum is σ = 159877632. Its totient is φ = 112413600.

The previous prime is 135521051. The next prime is 135521063. The reversal of 135521057 is 750125531.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (135521051) and next prime (135521063).

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 135521057 - 2¹⁶ = 135455521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135521051) 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, 312044 + ... + 312477.

It is an arithmetic number, because the mean of its divisors is an integer number (19984704).

Almost surely, 2^135521057 is an apocalyptic number.

It is an amenable number.

135521057 is a deficient number, since it is larger than the sum of its proper divisors (24356575).

135521057 is an equidigital number, since it uses as much as digits as its factorization.

135521057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624559.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 135521057 is about 11641.3511672829. The cubic root of 135521057 is about 513.6519329435.

Adding to 135521057 its reverse (750125531), we get a palindrome (885646588).

The spelling of 135521057 in words is "one hundred thirty-five million, five hundred twenty-one thousand, fifty-seven".