691992530591 has 4 divisors (see below), whose sum is σ = 694564993800. Its totient is φ = 689420067384.

The previous prime is 691992530539. The next prime is 691992530653. The reversal of 691992530591 is 195035299196.

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 691992530591 - 2³⁸ = 417114623647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691992530591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691992530191) 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, 1286231201 + ... + 1286231738.

It is an arithmetic number, because the mean of its divisors is an integer number (173641248450).

Almost surely, 2^691992530591 is an apocalyptic number.

691992530591 is a deficient number, since it is larger than the sum of its proper divisors (2572463209).

691992530591 is a wasteful number, since it uses less digits than its factorization.

691992530591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572463208.

The product of its (nonzero) digits is 5904900, while the sum is 59.

The spelling of 691992530591 in words is "six hundred ninety-one billion, nine hundred ninety-two million, five hundred thirty thousand, five hundred ninety-one".