2851813 has 2 divisors, whose sum is σ = 2851814. Its totient is φ = 2851812.

The previous prime is 2851799. The next prime is 2851817. The reversal of 2851813 is 3181582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1723969 + 1127844 = 1313^2 + 1062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2851813 is a prime.

2851813 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2851817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1425906 + 1425907.

It is an arithmetic number, because the mean of its divisors is an integer number (1425907).

2^2851813 is an apocalyptic number.

It is an amenable number.

2851813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2851813 is an equidigital number, since it uses as much as digits as its factorization.

2851813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 28.

The square root of 2851813 is about 1688.7311805021. The cubic root of 2851813 is about 141.8100515207.

The spelling of 2851813 in words is "two million, eight hundred fifty-one thousand, eight hundred thirteen".