135680623 has 4 divisors (see below), whose sum is σ = 146117608. Its totient is φ = 125243640.

The previous prime is 135680599. The next prime is 135680651. The reversal of 135680623 is 326086531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326086531 = 19 ⋅17162449.

It is a cyclic number.

It is not a de Polignac number, because 135680623 - 2¹³ = 135672431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135680663) 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, 5218473 + ... + 5218498.

It is an arithmetic number, because the mean of its divisors is an integer number (36529402).

Almost surely, 2^135680623 is an apocalyptic number.

135680623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

135680623 is a deficient number, since it is larger than the sum of its proper divisors (10436985).

135680623 is a wasteful number, since it uses less digits than its factorization.

135680623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10436984.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 135680623 is about 11648.2025652029. The cubic root of 135680623 is about 513.8534495672.

The spelling of 135680623 in words is "one hundred thirty-five million, six hundred eighty thousand, six hundred twenty-three".