691107985 has 8 divisors (see below), whose sum is σ = 830388096. Its totient is φ = 552180720.

The previous prime is 691107983. The next prime is 691108039. The reversal of 691107985 is 589701196.

It is a happy number.

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

It is not a de Polignac number, because 691107985 - 2¹ = 691107983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691107983) 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, 83881 + ... + 91750.

It is an arithmetic number, because the mean of its divisors is an integer number (103798512).

Almost surely, 2^691107985 is an apocalyptic number.

It is an amenable number.

691107985 is a deficient number, since it is larger than the sum of its proper divisors (139280111).

691107985 is a wasteful number, since it uses less digits than its factorization.

691107985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176423.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 691107985 is about 26288.9327474510. The cubic root of 691107985 is about 884.1283234235.

The spelling of 691107985 in words is "six hundred ninety-one million, one hundred seven thousand, nine hundred eighty-five".