135781261 has 32 divisors (see below), whose sum is σ = 183140352. Its totient is φ = 97416960.

The previous prime is 135781253. The next prime is 135781267. The reversal of 135781261 is 162187531.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 135781261 - 2³ = 135781253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135781267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60420 + ... + 62626.

It is an arithmetic number, because the mean of its divisors is an integer number (5723136).

Almost surely, 2^135781261 is an apocalyptic number.

135781261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135781261 is a deficient number, since it is larger than the sum of its proper divisors (47359091).

135781261 is a wasteful number, since it uses less digits than its factorization.

135781261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289.

The product of its digits is 10080, while the sum is 34.

The square root of 135781261 is about 11652.5216584223. The cubic root of 135781261 is about 513.9804645182.

The spelling of 135781261 in words is "one hundred thirty-five million, seven hundred eighty-one thousand, two hundred sixty-one".