135990181 has 2 divisors, whose sum is σ = 135990182. Its totient is φ = 135990180.

The previous prime is 135990161. The next prime is 135990227. The reversal of 135990181 is 181099531.

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., 129276900 + 6713281 = 11370^2 + 2591^2 .

It is a cyclic number.

It is not a de Polignac number, because 135990181 - 2¹¹ = 135988133 is a prime.

It is a super-2 number, since 2×135990181² = 36986658656825522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135990181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135990161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67995090 + 67995091.

It is an arithmetic number, because the mean of its divisors is an integer number (67995091).

Almost surely, 2^135990181 is an apocalyptic number.

It is an amenable number.

135990181 is a deficient number, since it is larger than the sum of its proper divisors (1).

135990181 is an equidigital number, since it uses as much as digits as its factorization.

135990181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 37.

The square root of 135990181 is about 11661.4827959398. The cubic root of 135990181 is about 514.2439416505.

The spelling of 135990181 in words is "one hundred thirty-five million, nine hundred ninety thousand, one hundred eighty-one".