2045261 has 4 divisors (see below), whose sum is σ = 2048124. Its totient is φ = 2042400.

The previous prime is 2045213. The next prime is 2045311. The reversal of 2045261 is 1625402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1625402 = 2 ⋅812701.

It can be written as a sum of positive squares in 2 ways, for example, as 902500 + 1142761 = 950^2 + 1069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2045261 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641 + ... + 2121.

It is an arithmetic number, because the mean of its divisors is an integer number (512031).

2^2045261 is an apocalyptic number.

It is an amenable number.

2045261 is a deficient number, since it is larger than the sum of its proper divisors (2863).

2045261 is a wasteful number, since it uses less digits than its factorization.

2045261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2045261 is about 1430.1262182059. The cubic root of 2045261 is about 126.9354457302.

The spelling of 2045261 in words is "two million, forty-five thousand, two hundred sixty-one".