2249861 has 2 divisors, whose sum is σ = 2249862. Its totient is φ = 2249860.

The previous prime is 2249827. The next prime is 2249867. The reversal of 2249861 is 1689422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 649636 = 1265^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 2249861 - 2¹⁰ = 2248837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2249867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1124930 + 1124931.

It is an arithmetic number, because the mean of its divisors is an integer number (1124931).

2^2249861 is an apocalyptic number.

It is an amenable number.

2249861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2249861 is an equidigital number, since it uses as much as digits as its factorization.

2249861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 2249861 is about 1499.9536659511. The cubic root of 2249861 is about 131.0343712619.

The spelling of 2249861 in words is "two million, two hundred forty-nine thousand, eight hundred sixty-one".