135804181 has 2 divisors, whose sum is σ = 135804182. Its totient is φ = 135804180.

The previous prime is 135804173. The next prime is 135804199. The reversal of 135804181 is 181408531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77281681 + 58522500 = 8791^2 + 7650^2 .

It is a cyclic number.

It is not a de Polignac number, because 135804181 - 2³ = 135804173 is a prime.

It is a super-2 number, since 2×135804181² = 36885551154161522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135804131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67902090 + 67902091.

It is an arithmetic number, because the mean of its divisors is an integer number (67902091).

Almost surely, 2^135804181 is an apocalyptic number.

It is an amenable number.

135804181 is a deficient number, since it is larger than the sum of its proper divisors (1).

135804181 is an equidigital number, since it uses as much as digits as its factorization.

135804181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 135804181 is about 11653.5050950347. The cubic root of 135804181 is about 514.0093830139.

The spelling of 135804181 in words is "one hundred thirty-five million, eight hundred four thousand, one hundred eighty-one".