2261539 has 4 divisors (see below), whose sum is σ = 2584624. Its totient is φ = 1938456.

The previous prime is 2261531. The next prime is 2261549. The reversal of 2261539 is 9351622.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2261539 - 2³ = 2261531 is a prime.

It is a super-2 number, since 2×2261539² = 10229117297042, which contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161532 + ... + 161545.

It is an arithmetic number, because the mean of its divisors is an integer number (646156).

2^2261539 is an apocalyptic number.

2261539 is a deficient number, since it is larger than the sum of its proper divisors (323085).

2261539 is an equidigital number, since it uses as much as digits as its factorization.

2261539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323084.

The product of its digits is 3240, while the sum is 28.

The square root of 2261539 is about 1503.8414145115. The cubic root of 2261539 is about 131.2606933087.

The spelling of 2261539 in words is "two million, two hundred sixty-one thousand, five hundred thirty-nine".