135398381 has 2 divisors, whose sum is σ = 135398382. Its totient is φ = 135398380.

The previous prime is 135398369. The next prime is 135398413. The reversal of 135398381 is 183893531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85470025 + 49928356 = 9245^2 + 7066^2 .

It is a cyclic number.

It is not a de Polignac number, because 135398381 - 2²² = 131204077 is a prime.

It is a super-2 number, since 2×135398381² = 36665443154842322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135398321) 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 as a sum of consecutive naturals, namely, 67699190 + 67699191.

It is an arithmetic number, because the mean of its divisors is an integer number (67699191).

Almost surely, 2^135398381 is an apocalyptic number.

It is an amenable number.

135398381 is a deficient number, since it is larger than the sum of its proper divisors (1).

135398381 is an equidigital number, since it uses as much as digits as its factorization.

135398381 is an odious number, because the sum of its binary digits is odd.

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

The square root of 135398381 is about 11636.0809983430. The cubic root of 135398381 is about 513.4968972885.

The spelling of 135398381 in words is "one hundred thirty-five million, three hundred ninety-eight thousand, three hundred eighty-one".