685156111 has 2 divisors, whose sum is σ = 685156112. Its totient is φ = 685156110.

The previous prime is 685156099. The next prime is 685156123. The reversal of 685156111 is 111651586.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (685156099) and next prime (685156123).

It is a cyclic number.

It is not a de Polignac number, because 685156111 - 2¹³ = 685147919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685756111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342578055 + 342578056.

It is an arithmetic number, because the mean of its divisors is an integer number (342578056).

Almost surely, 2^685156111 is an apocalyptic number.

685156111 is a deficient number, since it is larger than the sum of its proper divisors (1).

685156111 is an equidigital number, since it uses as much as digits as its factorization.

685156111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 34.

The square root of 685156111 is about 26175.4868340591. The cubic root of 685156111 is about 881.5829424791.

The spelling of 685156111 in words is "six hundred eighty-five million, one hundred fifty-six thousand, one hundred eleven".