2261521 has 4 divisors (see below), whose sum is σ = 2359872. Its totient is φ = 2163172.

The previous prime is 2261509. The next prime is 2261531. The reversal of 2261521 is 1251622.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1251622 = 2 ⋅625811.

It is a cyclic number.

It is not a de Polignac number, because 2261521 - 2⁷ = 2261393 is a prime.

It is a super-2 number, since 2×2261521² = 10228954466882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2261531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49141 + ... + 49186.

It is an arithmetic number, because the mean of its divisors is an integer number (589968).

2^2261521 is an apocalyptic number.

It is an amenable number.

2261521 is a deficient number, since it is larger than the sum of its proper divisors (98351).

2261521 is an equidigital number, since it uses as much as digits as its factorization.

2261521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98350.

The product of its digits is 240, while the sum is 19.

The square root of 2261521 is about 1503.8354298260. The cubic root of 2261521 is about 131.2603450652.

The spelling of 2261521 in words is "two million, two hundred sixty-one thousand, five hundred twenty-one".