11533561 has 8 divisors (see below), whose sum is σ = 12849480. Its totient is φ = 10278912.

The previous prime is 11533559. The next prime is 11533583. The reversal of 11533561 is 16533511.

It can be written as a sum of positive squares in 4 ways, for example, as 1010025 + 10523536 = 1005^2 + 3244^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11533561 - 2¹ = 11533559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11533541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14920 + ... + 15673.

It is an arithmetic number, because the mean of its divisors is an integer number (1606185).

Almost surely, 2^11533561 is an apocalyptic number.

It is an amenable number.

11533561 is a deficient number, since it is larger than the sum of its proper divisors (1315919).

11533561 is a wasteful number, since it uses less digits than its factorization.

11533561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30635.

The product of its digits is 1350, while the sum is 25.

The square root of 11533561 is about 3396.1096860967. The cubic root of 11533561 is about 225.9372329413.

The spelling of 11533561 in words is "eleven million, five hundred thirty-three thousand, five hundred sixty-one".