2909813 has 2 divisors, whose sum is σ = 2909814. Its totient is φ = 2909812.

The previous prime is 2909789. The next prime is 2909827. The reversal of 2909813 is 3189092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2900209 + 9604 = 1703^2 + 98^2 .

It is a cyclic number.

It is not a de Polignac number, because 2909813 - 2⁶ = 2909749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2909813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2909833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1454906 + 1454907.

It is an arithmetic number, because the mean of its divisors is an integer number (1454907).

2^2909813 is an apocalyptic number.

It is an amenable number.

2909813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2909813 is an equidigital number, since it uses as much as digits as its factorization.

2909813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2909813 is about 1705.8173993719. The cubic root of 2909813 is about 142.7649814615.

The spelling of 2909813 in words is "two million, nine hundred nine thousand, eight hundred thirteen".