2290861 has 2 divisors, whose sum is σ = 2290862. Its totient is φ = 2290860.

The previous prime is 2290843. The next prime is 2290889. The reversal of 2290861 is 1680922.

It is a happy number.

It is an a-pointer prime, because the next prime (2290889) can be obtained adding 2290861 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1705636 + 585225 = 1306^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 2290861 - 2⁵ = 2290829 is a prime.

It is a Chen prime.

2290861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2290831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145430 + 1145431.

It is an arithmetic number, because the mean of its divisors is an integer number (1145431).

2^2290861 is an apocalyptic number.

It is an amenable number.

2290861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2290861 is an equidigital number, since it uses as much as digits as its factorization.

2290861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2290861 is about 1513.5590507146. The cubic root of 2290861 is about 131.8255462466.

The spelling of 2290861 in words is "two million, two hundred ninety thousand, eight hundred sixty-one".