845657 has 2 divisors, whose sum is σ = 845658. Its totient is φ = 845656.

The previous prime is 845653. The next prime is 845659. The reversal of 845657 is 756548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811801 + 33856 = 901^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 845657 - 2² = 845653 is a prime.

Together with 845659, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 845657.

It is not a weakly prime, because it can be changed into another prime (845653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422828 + 422829.

It is an arithmetic number, because the mean of its divisors is an integer number (422829).

2⁸⁴⁵⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

845657 is a deficient number, since it is larger than the sum of its proper divisors (1).

845657 is an equidigital number, since it uses as much as digits as its factorization.

845657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 845657 is about 919.5961069948. The cubic root of 845657 is about 94.5652153816.

The spelling of 845657 in words is "eight hundred forty-five thousand, six hundred fifty-seven".