135171481 has 2 divisors, whose sum is σ = 135171482. Its totient is φ = 135171480.

The previous prime is 135171479. The next prime is 135171493. The reversal of 135171481 is 184171531.

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., 69155856 + 66015625 = 8316^2 + 8125^2 .

It is an emirp because it is prime and its reverse (184171531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135171481 - 2¹ = 135171479 is a prime.

It is a super-2 number, since 2×135171481² = 36542658551466722, which contains 22 as substring.

Together with 135171479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (135171401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67585740 + 67585741.

It is an arithmetic number, because the mean of its divisors is an integer number (67585741).

Almost surely, 2^135171481 is an apocalyptic number.

It is an amenable number.

135171481 is a deficient number, since it is larger than the sum of its proper divisors (1).

135171481 is an equidigital number, since it uses as much as digits as its factorization.

135171481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 31.

The square root of 135171481 is about 11626.3270640388. The cubic root of 135171481 is about 513.2098983119.

Subtracting 135171481 from its reverse (184171531), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 135171481 in words is "one hundred thirty-five million, one hundred seventy-one thousand, four hundred eighty-one".