691792609 has 4 divisors (see below), whose sum is σ = 692224704. Its totient is φ = 691360516.

The previous prime is 691792567. The next prime is 691792613. The reversal of 691792609 is 906297196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 691792609 - 2⁹ = 691792097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691792649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213637 + ... + 216850.

It is an arithmetic number, because the mean of its divisors is an integer number (173056176).

Almost surely, 2^691792609 is an apocalyptic number.

It is an amenable number.

691792609 is a deficient number, since it is larger than the sum of its proper divisors (432095).

691792609 is a wasteful number, since it uses less digits than its factorization.

691792609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432094.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 691792609 is about 26301.9506691044. The cubic root of 691792609 is about 884.4201715476.

The spelling of 691792609 in words is "six hundred ninety-one million, seven hundred ninety-two thousand, six hundred nine".