11355561 has 12 divisors (see below), whose sum is σ = 18745792. Its totient is φ = 6488856.

The previous prime is 11355493. The next prime is 11355563. The reversal of 11355561 is 16555311.

11355561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11355561 - 2⁷ = 11355433 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (11355563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90061 + ... + 90186.

Almost surely, 2^11355561 is an apocalyptic number.

It is an amenable number.

11355561 is a deficient number, since it is larger than the sum of its proper divisors (7390231).

11355561 is a wasteful number, since it uses less digits than its factorization.

11355561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180260 (or 180257 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 11355561 is about 3369.8013294555. The cubic root of 11355561 is about 224.7688886184.

The spelling of 11355561 in words is "eleven million, three hundred fifty-five thousand, five hundred sixty-one".