135321451 has 4 divisors (see below), whose sum is σ = 135803304. Its totient is φ = 134839600.

The previous prime is 135321449. The next prime is 135321463. The reversal of 135321451 is 154123531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135321451 - 2¹ = 135321449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135324451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240505 + ... + 241066.

It is an arithmetic number, because the mean of its divisors is an integer number (33950826).

Almost surely, 2^135321451 is an apocalyptic number.

135321451 is a deficient number, since it is larger than the sum of its proper divisors (481853).

135321451 is an equidigital number, since it uses as much as digits as its factorization.

135321451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481852.

The product of its digits is 1800, while the sum is 25.

The square root of 135321451 is about 11632.7748624307. The cubic root of 135321451 is about 513.3996267993.

Adding to 135321451 its reverse (154123531), we get a palindrome (289444982).

The spelling of 135321451 in words is "one hundred thirty-five million, three hundred twenty-one thousand, four hundred fifty-one".