684742111 has 2 divisors, whose sum is σ = 684742112. Its totient is φ = 684742110.

The previous prime is 684742087. The next prime is 684742129. The reversal of 684742111 is 111247486.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684742111 - 2⁷ = 684741983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684742151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342371055 + 342371056.

It is an arithmetic number, because the mean of its divisors is an integer number (342371056).

Almost surely, 2^684742111 is an apocalyptic number.

684742111 is a deficient number, since it is larger than the sum of its proper divisors (1).

684742111 is an equidigital number, since it uses as much as digits as its factorization.

684742111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 684742111 is about 26167.5774767173. The cubic root of 684742111 is about 881.4053435990.

Adding to 684742111 its reverse (111247486), we get a palindrome (795989597).

The spelling of 684742111 in words is "six hundred eighty-four million, seven hundred forty-two thousand, one hundred eleven".