1657213 has 2 divisors, whose sum is σ = 1657214. Its totient is φ = 1657212.

The previous prime is 1657207. The next prime is 1657231. The reversal of 1657213 is 3127561.

Together with next prime (1657231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1643524 + 13689 = 1282^2 + 117^2 .

It is an emirp because it is prime and its reverse (3127561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1657213 - 2⁵ = 1657181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1657283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828606 + 828607.

It is an arithmetic number, because the mean of its divisors is an integer number (828607).

2^1657213 is an apocalyptic number.

It is an amenable number.

1657213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657213 is an equidigital number, since it uses as much as digits as its factorization.

1657213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 1657213 is about 1287.3278525690. The cubic root of 1657213 is about 118.3385137365.

The spelling of 1657213 in words is "one million, six hundred fifty-seven thousand, two hundred thirteen".