135402451 has 4 divisors (see below), whose sum is σ = 139770304. Its totient is φ = 131034600.

The previous prime is 135402437. The next prime is 135402469. The reversal of 135402451 is 154204531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154204531 = 13 ⋅11861887.

It is a cyclic number.

It is not a de Polignac number, because 135402451 - 2⁵ = 135402419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135402481) 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 3 ways as a sum of consecutive naturals, for example, 2183880 + ... + 2183941.

It is an arithmetic number, because the mean of its divisors is an integer number (34942576).

Almost surely, 2^135402451 is an apocalyptic number.

135402451 is a deficient number, since it is larger than the sum of its proper divisors (4367853).

135402451 is an equidigital number, since it uses as much as digits as its factorization.

135402451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4367852.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 135402451 is about 11636.2558840892. The cubic root of 135402451 is about 513.5020423806.

Adding to 135402451 its reverse (154204531), we get a palindrome (289606982).

The spelling of 135402451 in words is "one hundred thirty-five million, four hundred two thousand, four hundred fifty-one".