135668261 has 4 divisors (see below), whose sum is σ = 136209024. Its totient is φ = 135127500.

The previous prime is 135668257. The next prime is 135668263. The reversal of 135668261 is 162866531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135668261 - 2² = 135668257 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 (135668263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270005 + ... + 270506.

It is an arithmetic number, because the mean of its divisors is an integer number (34052256).

Almost surely, 2^135668261 is an apocalyptic number.

It is an amenable number.

135668261 is a deficient number, since it is larger than the sum of its proper divisors (540763).

135668261 is an equidigital number, since it uses as much as digits as its factorization.

135668261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540762.

The product of its digits is 51840, while the sum is 38.

The square root of 135668261 is about 11647.6719133053. The cubic root of 135668261 is about 513.8378431892.

The spelling of 135668261 in words is "one hundred thirty-five million, six hundred sixty-eight thousand, two hundred sixty-one".