135389251 has 4 divisors (see below), whose sum is σ = 135412600. Its totient is φ = 135365904.

The previous prime is 135389237. The next prime is 135389263. The reversal of 135389251 is 152983531.

135389251 = T₉₄₉₉ + T₉₅₀₀ + T₉₅₀₁.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 152983531 = 103 ⋅1485277.

It is a cyclic number.

It is not a de Polignac number, because 135389251 - 2²¹ = 133292099 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 135389251.

It is not an unprimeable number, because it can be changed into a prime (135380251) 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, 4420 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (33853150).

Almost surely, 2^135389251 is an apocalyptic number.

135389251 is the 9501-st centered triangular number.

135389251 is a deficient number, since it is larger than the sum of its proper divisors (23349).

135389251 is a wasteful number, since it uses less digits than its factorization.

135389251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23348.

The product of its digits is 32400, while the sum is 37.

The square root of 135389251 is about 11635.6886775128. The cubic root of 135389251 is about 513.4853552203.

The spelling of 135389251 in words is "one hundred thirty-five million, three hundred eighty-nine thousand, two hundred fifty-one".