135389381 has 4 divisors (see below), whose sum is σ = 136910700. Its totient is φ = 133868064.

The previous prime is 135389363. The next prime is 135389407. The reversal of 135389381 is 183983531.

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: 183983531 = 4423 ⋅41597.

It can be written as a sum of positive squares in 2 ways, for example, as 41396356 + 93993025 = 6434^2 + 9695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135389381 is a prime.

It is a super-2 number, since 2×135389381² = 36660568975126322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135389341) 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, 760526 + ... + 760703.

It is an arithmetic number, because the mean of its divisors is an integer number (34227675).

Almost surely, 2^135389381 is an apocalyptic number.

It is an amenable number.

135389381 is a deficient number, since it is larger than the sum of its proper divisors (1521319).

135389381 is an equidigital number, since it uses as much as digits as its factorization.

135389381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521318.

The product of its digits is 77760, while the sum is 41.

The square root of 135389381 is about 11635.6942637730. The cubic root of 135389381 is about 513.4855195688.

The spelling of 135389381 in words is "one hundred thirty-five million, three hundred eighty-nine thousand, three hundred eighty-one".