691192135 has 4 divisors (see below), whose sum is σ = 829430568. Its totient is φ = 552953704.

The previous prime is 691192129. The next prime is 691192163. The reversal of 691192135 is 531291196.

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 691192135 - 2¹⁵ = 691159367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691192094 and 691192103.

It is a congruent number.

It is an unprimeable number.

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, 69119209 + ... + 69119218.

It is an arithmetic number, because the mean of its divisors is an integer number (207357642).

Almost surely, 2^691192135 is an apocalyptic number.

691192135 is a deficient number, since it is larger than the sum of its proper divisors (138238433).

691192135 is a wasteful number, since it uses less digits than its factorization.

691192135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138238432.

The product of its digits is 14580, while the sum is 37.

The square root of 691192135 is about 26290.5331821171. The cubic root of 691192135 is about 884.1642060837.

The spelling of 691192135 in words is "six hundred ninety-one million, one hundred ninety-two thousand, one hundred thirty-five".