135736691 has 4 divisors (see below), whose sum is σ = 139047384. Its totient is φ = 132426000.

The previous prime is 135736663. The next prime is 135736709. The reversal of 135736691 is 196637531.

135736691 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, and also an emirpimes, since its reverse is a distinct semiprime: 196637531 = 5849 ⋅33619.

It is a cyclic number.

It is not a de Polignac number, because 135736691 - 2¹⁴ = 135720307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 3310651 = 135736691 / (1 + 3 + 5 + 7 + 3 + 6 + 6 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135736661) 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, 1655285 + ... + 1655366.

It is an arithmetic number, because the mean of its divisors is an integer number (34761846).

Almost surely, 2^135736691 is an apocalyptic number.

135736691 is a deficient number, since it is larger than the sum of its proper divisors (3310693).

135736691 is an equidigital number, since it uses as much as digits as its factorization.

135736691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310692.

The product of its digits is 102060, while the sum is 41.

The square root of 135736691 is about 11650.6090398743. The cubic root of 135736691 is about 513.9242205856.

The spelling of 135736691 in words is "one hundred thirty-five million, seven hundred thirty-six thousand, six hundred ninety-one".