658681 has 2 divisors, whose sum is σ = 658682. Its totient is φ = 658680.

The previous prime is 658663. The next prime is 658703. The reversal of 658681 is 186856.

It is a happy number.

658681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 147456 = 715^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 658681 - 2⁵ = 658649 is a prime.

It is a super-2 number, since 2×658681² = 867721319522, which contains 22 as substring.

658681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (658601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329340 + 329341.

It is an arithmetic number, because the mean of its divisors is an integer number (329341).

2⁶⁵⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

658681 is a deficient number, since it is larger than the sum of its proper divisors (1).

658681 is an equidigital number, since it uses as much as digits as its factorization.

658681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 658681 is about 811.5916460881. The cubic root of 658681 is about 87.0078382862.

The spelling of 658681 in words is "six hundred fifty-eight thousand, six hundred eighty-one".