135404451251 has 4 divisors (see below), whose sum is σ = 137959252272. Its totient is φ = 132849650232.

The previous prime is 135404451211. The next prime is 135404451323. The reversal of 135404451251 is 152154404531.

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: 152154404531 = 409 ⋅372015659.

It is a cyclic number.

It is not a de Polignac number, because 135404451251 - 2³⁰ = 134330709427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135404451211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277400431 + ... + 1277400536.

It is an arithmetic number, because the mean of its divisors is an integer number (34489813068).

Almost surely, 2^135404451251 is an apocalyptic number.

135404451251 is a deficient number, since it is larger than the sum of its proper divisors (2554801021).

135404451251 is an equidigital number, since it uses as much as digits as its factorization.

135404451251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554801020.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 135404451251 its reverse (152154404531), we get a palindrome (287558855782).

The spelling of 135404451251 in words is "one hundred thirty-five billion, four hundred four million, four hundred fifty-one thousand, two hundred fifty-one".