135451181 has 2 divisors, whose sum is σ = 135451182. Its totient is φ = 135451180.

The previous prime is 135451159. The next prime is 135451213. The reversal of 135451181 is 181154531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133033156 + 2418025 = 11534^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 135451181 - 2¹⁰ = 135450157 is a prime.

It is a super-2 number, since 2×135451181² = 36694044868589522, 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 (135451081) 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, 67725590 + 67725591.

It is an arithmetic number, because the mean of its divisors is an integer number (67725591).

Almost surely, 2^135451181 is an apocalyptic number.

It is an amenable number.

135451181 is a deficient number, since it is larger than the sum of its proper divisors (1).

135451181 is an equidigital number, since it uses as much as digits as its factorization.

135451181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 29.

The square root of 135451181 is about 11638.3495823076. The cubic root of 135451181 is about 513.5636364239.

The spelling of 135451181 in words is "one hundred thirty-five million, four hundred fifty-one thousand, one hundred eighty-one".