684771011 has 4 divisors (see below), whose sum is σ = 691551024. Its totient is φ = 677991000.

The previous prime is 684770993. The next prime is 684771013. The reversal of 684771011 is 110177486.

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-684771011 is a prime.

It is a super-2 number, since 2×684771011² = 937822675011924242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684771013) 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 3 ways as a sum of consecutive naturals, for example, 3389855 + ... + 3390056.

It is an arithmetic number, because the mean of its divisors is an integer number (172887756).

Almost surely, 2^684771011 is an apocalyptic number.

684771011 is a deficient number, since it is larger than the sum of its proper divisors (6780013).

684771011 is a wasteful number, since it uses less digits than its factorization.

684771011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780012.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 684771011 is about 26168.1296809688. The cubic root of 684771011 is about 881.4177435258.

The spelling of 684771011 in words is "six hundred eighty-four million, seven hundred seventy-one thousand, eleven".