691315199 has 4 divisors (see below), whose sum is σ = 704358936. Its totient is φ = 678271464.

The previous prime is 691315193. The next prime is 691315211. The reversal of 691315199 is 991513196.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691315199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691315193) 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, 6521789 + ... + 6521894.

It is an arithmetic number, because the mean of its divisors is an integer number (176089734).

Almost surely, 2^691315199 is an apocalyptic number.

691315199 is a deficient number, since it is larger than the sum of its proper divisors (13043737).

691315199 is a wasteful number, since it uses less digits than its factorization.

691315199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13043736.

The product of its digits is 65610, while the sum is 44.

The square root of 691315199 is about 26292.8735401819. The cubic root of 691315199 is about 884.2166769387.

The spelling of 691315199 in words is "six hundred ninety-one million, three hundred fifteen thousand, one hundred ninety-nine".