1133561 has 8 divisors (see below), whose sum is σ = 1331904. Its totient is φ = 951120.

The previous prime is 1133551. The next prime is 1133579. The reversal of 1133561 is 1653311.

1133561 = 316² + 317² + ... + 326².

It is a happy number.

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 1133561 - 2¹⁴ = 1117177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1133501) 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, 3821 + ... + 4106.

It is an arithmetic number, because the mean of its divisors is an integer number (166488).

2^1133561 is an apocalyptic number.

1133561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1133561 is a deficient number, since it is larger than the sum of its proper divisors (198343).

1133561 is a wasteful number, since it uses less digits than its factorization.

1133561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7951.

The product of its digits is 270, while the sum is 20.

The square root of 1133561 is about 1064.6882172730. The cubic root of 1133561 is about 104.2673410339.

Adding to 1133561 its reverse (1653311), we get a palindrome (2786872).

The spelling of 1133561 in words is "one million, one hundred thirty-three thousand, five hundred sixty-one".