135661807 has 4 divisors (see below), whose sum is σ = 135721120. Its totient is φ = 135602496.

The previous prime is 135661789. The next prime is 135661829. The reversal of 135661807 is 708166531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708166531 = 47 ⋅15067373.

It is a cyclic number.

It is not a de Polignac number, because 135661807 - 2⁷ = 135661679 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 (135661837) 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, 26082 + ... + 30847.

It is an arithmetic number, because the mean of its divisors is an integer number (33930280).

Almost surely, 2^135661807 is an apocalyptic number.

135661807 is a deficient number, since it is larger than the sum of its proper divisors (59313).

135661807 is an equidigital number, since it uses as much as digits as its factorization.

135661807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59312.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 135661807 is about 11647.3948589373. The cubic root of 135661807 is about 513.8296949753.

The spelling of 135661807 in words is "one hundred thirty-five million, six hundred sixty-one thousand, eight hundred seven".