135521351 has 8 divisors (see below), whose sum is σ = 158177280. Its totient is φ = 113689368.

The previous prime is 135521341. The next prime is 135521363. The reversal of 135521351 is 153125531.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135521351 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 135521351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205631 + ... + 206288.

It is an arithmetic number, because the mean of its divisors is an integer number (19772160).

Almost surely, 2^135521351 is an apocalyptic number.

135521351 is a deficient number, since it is larger than the sum of its proper divisors (22655929).

135521351 is an equidigital number, since it uses as much as digits as its factorization.

135521351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411973.

The product of its digits is 2250, while the sum is 26.

The square root of 135521351 is about 11641.3637946763. The cubic root of 135521351 is about 513.6523043829.

Adding to 135521351 its reverse (153125531), we get a palindrome (288646882).

The spelling of 135521351 in words is "one hundred thirty-five million, five hundred twenty-one thousand, three hundred fifty-one".