1135561 has 8 divisors (see below), whose sum is σ = 1339904. Its totient is φ = 941760.

The previous prime is 1135531. The next prime is 1135597. The reversal of 1135561 is 1655311.

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 1135561 - 2¹¹ = 1133513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1135531) 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, 2400 + ... + 2833.

It is an arithmetic number, because the mean of its divisors is an integer number (167488).

2^1135561 is an apocalyptic number.

It is an amenable number.

1135561 is a deficient number, since it is larger than the sum of its proper divisors (204343).

1135561 is an equidigital number, since it uses as much as digits as its factorization.

1135561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271.

The product of its digits is 450, while the sum is 22.

The square root of 1135561 is about 1065.6270454526. The cubic root of 1135561 is about 104.3286264167.

The spelling of 1135561 in words is "one million, one hundred thirty-five thousand, five hundred sixty-one".