1642813 has 2 divisors, whose sum is σ = 1642814. Its totient is φ = 1642812.

The previous prime is 1642811. The next prime is 1642831. The reversal of 1642813 is 3182461.

Together with next prime (1642831) 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., 1006009 + 636804 = 1003^2 + 798^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642813 - 2¹ = 1642811 is a prime.

Together with 1642811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821406 + 821407.

It is an arithmetic number, because the mean of its divisors is an integer number (821407).

2^1642813 is an apocalyptic number.

It is an amenable number.

1642813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642813 is an equidigital number, since it uses as much as digits as its factorization.

1642813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 1642813 is about 1281.7226689109. The cubic root of 1642813 is about 117.9947570207.

The spelling of 1642813 in words is "one million, six hundred forty-two thousand, eight hundred thirteen".