2261564 has 6 divisors (see below), whose sum is σ = 3957744. Its totient is φ = 1130780.

The previous prime is 2261557. The next prime is 2261569. The reversal of 2261564 is 4651622.

It is a super-2 number, since 2×2261564² = 10229343452192, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2261569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282692 + ... + 282699.

It is an arithmetic number, because the mean of its divisors is an integer number (659624).

2^2261564 is an apocalyptic number.

It is an amenable number.

2261564 is a deficient number, since it is larger than the sum of its proper divisors (1696180).

2261564 is a wasteful number, since it uses less digits than its factorization.

2261564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565395 (or 565393 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 2261564 is about 1503.8497265352. The cubic root of 2261564 is about 131.2611769771.

The spelling of 2261564 in words is "two million, two hundred sixty-one thousand, five hundred sixty-four".