11265581 has 4 divisors (see below), whose sum is σ = 11433792. Its totient is φ = 11097372.

The previous prime is 11265563. The next prime is 11265593. The reversal of 11265581 is 18556211.

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: 18556211 = 47 ⋅394813.

It is a cyclic number.

It is not a de Polignac number, because 11265581 - 2⁶ = 11265517 is a prime.

It is a super-2 number, since 2×11265581² = 253826630535122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11265511) 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, 84005 + ... + 84138.

It is an arithmetic number, because the mean of its divisors is an integer number (2858448).

Almost surely, 2^11265581 is an apocalyptic number.

It is an amenable number.

11265581 is a deficient number, since it is larger than the sum of its proper divisors (168211).

11265581 is an equidigital number, since it uses as much as digits as its factorization.

11265581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168210.

The product of its digits is 2400, while the sum is 29.

The square root of 11265581 is about 3356.4238409355. The cubic root of 11265581 is about 224.1736337084.

The spelling of 11265581 in words is "eleven million, two hundred sixty-five thousand, five hundred eighty-one".