2261905 has 8 divisors (see below), whose sum is σ = 2751912. Its totient is φ = 1784448.

The previous prime is 2261891. The next prime is 2261911. The reversal of 2261905 is 5091622.

It can be written as a sum of positive squares in 4 ways, for example, as 199809 + 2062096 = 447^2 + 1436^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2261905 - 2⁹ = 2261393 is a prime.

It is a Duffinian number.

2261905 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2261905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734 + ... + 3463.

It is an arithmetic number, because the mean of its divisors is an integer number (343989).

2^2261905 is an apocalyptic number.

It is an amenable number.

2261905 is a deficient number, since it is larger than the sum of its proper divisors (490007).

2261905 is an equidigital number, since it uses as much as digits as its factorization.

2261905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2261905 is about 1503.9630979515. The cubic root of 2261905 is about 131.2677738590.

The spelling of 2261905 in words is "two million, two hundred sixty-one thousand, nine hundred five".