691900689 has 8 divisors (see below), whose sum is σ = 923014912. Its totient is φ = 461026800.

The previous prime is 691900679. The next prime is 691900691. The reversal of 691900689 is 986009196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691900689 - 2⁹ = 691900177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691900619) 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 7 ways as a sum of consecutive naturals, for example, 53254 + ... + 64959.

It is an arithmetic number, because the mean of its divisors is an integer number (115376864).

Almost surely, 2^691900689 is an apocalyptic number.

It is an amenable number.

691900689 is a deficient number, since it is larger than the sum of its proper divisors (231114223).

691900689 is a wasteful number, since it uses less digits than its factorization.

691900689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120167.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 691900689 is about 26304.0051893243. The cubic root of 691900689 is about 884.4662273324.

The spelling of 691900689 in words is "six hundred ninety-one million, nine hundred thousand, six hundred eighty-nine".