685051 has 2 divisors, whose sum is σ = 685052. Its totient is φ = 685050.

The previous prime is 685039. The next prime is 685057. The reversal of 685051 is 150586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685051 - 2⁵ = 685019 is a prime.

It is not a weakly prime, because it can be changed into another prime (685057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342525 + 342526.

It is an arithmetic number, because the mean of its divisors is an integer number (342526).

2⁶⁸⁵⁰⁵¹ is an apocalyptic number.

685051 is a deficient number, since it is larger than the sum of its proper divisors (1).

685051 is an equidigital number, since it uses as much as digits as its factorization.

685051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 685051 is about 827.6780775156. The cubic root of 685051 is about 88.1537858445.

The spelling of 685051 in words is "six hundred eighty-five thousand, fifty-one".