135642761 has 4 divisors (see below), whose sum is σ = 136887300. Its totient is φ = 134398224.

The previous prime is 135642739. The next prime is 135642791. The reversal of 135642761 is 167246531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97140736 + 38502025 = 9856^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 135642761 - 2²⁶ = 68533897 is a prime.

It is a super-2 number, since 2×135642761² = 36797917223406242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135642791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622106 + ... + 622323.

It is an arithmetic number, because the mean of its divisors is an integer number (34221825).

Almost surely, 2^135642761 is an apocalyptic number.

It is an amenable number.

135642761 is a deficient number, since it is larger than the sum of its proper divisors (1244539).

135642761 is a wasteful number, since it uses less digits than its factorization.

135642761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244538.

The product of its digits is 30240, while the sum is 35.

The square root of 135642761 is about 11646.5772225148. The cubic root of 135642761 is about 513.8056477788.

The spelling of 135642761 in words is "one hundred thirty-five million, six hundred forty-two thousand, seven hundred sixty-one".