2205949 has 2 divisors, whose sum is σ = 2205950. Its totient is φ = 2205948.

The previous prime is 2205947. The next prime is 2205989. The reversal of 2205949 is 9495022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428025 + 777924 = 1195^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205949 - 2¹ = 2205947 is a prime.

Together with 2205947, it forms a pair of twin primes.

2205949 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2205949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2205947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102974 + 1102975.

It is an arithmetic number, because the mean of its divisors is an integer number (1102975).

2^2205949 is an apocalyptic number.

It is an amenable number.

2205949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205949 is an equidigital number, since it uses as much as digits as its factorization.

2205949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 2205949 is about 1485.2437510389. The cubic root of 2205949 is about 130.1762697598.

The spelling of 2205949 in words is "two million, two hundred five thousand, nine hundred forty-nine".