684947111 has 4 divisors (see below), whose sum is σ = 685229472. Its totient is φ = 684664752.

The previous prime is 684947099. The next prime is 684947149. The reversal of 684947111 is 111749486.

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-684947111 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 (684947161) 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, 137510 + ... + 142403.

It is an arithmetic number, because the mean of its divisors is an integer number (171307368).

Almost surely, 2^684947111 is an apocalyptic number.

684947111 is a deficient number, since it is larger than the sum of its proper divisors (282361).

684947111 is a wasteful number, since it uses less digits than its factorization.

684947111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282360.

The product of its digits is 48384, while the sum is 41.

The square root of 684947111 is about 26171.4942446930. The cubic root of 684947111 is about 881.4932940180.

The spelling of 684947111 in words is "six hundred eighty-four million, nine hundred forty-seven thousand, one hundred eleven".