135500861 has 4 divisors (see below), whose sum is σ = 136203132. Its totient is φ = 134798592.

The previous prime is 135500851. The next prime is 135500881. The reversal of 135500861 is 168005531.

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 65108761 + 70392100 = 8069^2 + 8390^2 .

It is a cyclic number.

It is not a de Polignac number, because 135500861 - 2¹⁸ = 135238717 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 (135500851) 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, 350846 + ... + 351231.

It is an arithmetic number, because the mean of its divisors is an integer number (34050783).

Almost surely, 2^135500861 is an apocalyptic number.

It is an amenable number.

135500861 is a deficient number, since it is larger than the sum of its proper divisors (702271).

135500861 is an equidigital number, since it uses as much as digits as its factorization.

135500861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702270.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 135500861 is about 11640.4837098808. The cubic root of 135500861 is about 513.6264160484.

The spelling of 135500861 in words is "one hundred thirty-five million, five hundred thousand, eight hundred sixty-one".