691346047 has 6 divisors (see below), whose sum is σ = 804218928. Its totient is φ = 592582284.

The previous prime is 691346041. The next prime is 691346137. The reversal of 691346047 is 740643196.

It is not a de Polignac number, because 691346047 - 2³ = 691346039 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 (691346041) 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 5 ways as a sum of consecutive naturals, for example, 7054503 + ... + 7054600.

It is an arithmetic number, because the mean of its divisors is an integer number (134036488).

Almost surely, 2^691346047 is an apocalyptic number.

691346047 is a deficient number, since it is larger than the sum of its proper divisors (112872881).

691346047 is a wasteful number, since it uses less digits than its factorization.

691346047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14109117 (or 14109110 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 691346047 is about 26293.4601564724. The cubic root of 691346047 is about 884.2298286387.

The spelling of 691346047 in words is "six hundred ninety-one million, three hundred forty-six thousand, forty-seven".