135566791 has 4 divisors (see below), whose sum is σ = 136601784. Its totient is φ = 134531800.

The previous prime is 135566777. The next prime is 135566797. The reversal of 135566791 is 197665531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135566791 - 2⁷ = 135566663 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 (135566797) 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, 517300 + ... + 517561.

It is an arithmetic number, because the mean of its divisors is an integer number (34150446).

Almost surely, 2^135566791 is an apocalyptic number.

135566791 is a deficient number, since it is larger than the sum of its proper divisors (1034993).

135566791 is a wasteful number, since it uses less digits than its factorization.

135566791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034992.

The product of its digits is 170100, while the sum is 43.

The square root of 135566791 is about 11643.3152924758. The cubic root of 135566791 is about 513.7097067832.

The spelling of 135566791 in words is "one hundred thirty-five million, five hundred sixty-six thousand, seven hundred ninety-one".