135679861 has 4 divisors (see below), whose sum is σ = 136262412. Its totient is φ = 135097312.

The previous prime is 135679853. The next prime is 135679897. The reversal of 135679861 is 168976531.

It is a happy number.

135679861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 73427761 + 62252100 = 8569^2 + 7890^2 .

It is a cyclic number.

It is not a de Polignac number, because 135679861 - 2³ = 135679853 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 (135679801) 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, 290926 + ... + 291391.

It is an arithmetic number, because the mean of its divisors is an integer number (34065603).

Almost surely, 2^135679861 is an apocalyptic number.

It is an amenable number.

135679861 is a deficient number, since it is larger than the sum of its proper divisors (582551).

135679861 is an equidigital number, since it uses as much as digits as its factorization.

135679861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582550.

The product of its digits is 272160, while the sum is 46.

The square root of 135679861 is about 11648.1698562478. The cubic root of 135679861 is about 513.8524876095.

The spelling of 135679861 in words is "one hundred thirty-five million, six hundred seventy-nine thousand, eight hundred sixty-one".