11351561 has 6 divisors (see below), whose sum is σ = 12292110. Its totient is φ = 10478208.

The previous prime is 11351539. The next prime is 11351591. The reversal of 11351561 is 16515311.

It can be written as a sum of positive squares in 3 ways, for example, as 295936 + 11055625 = 544^2 + 3325^2 .

It is not a de Polignac number, because 11351561 - 2²² = 7157257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11351521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33416 + ... + 33753.

It is an arithmetic number, because the mean of its divisors is an integer number (2048685).

Almost surely, 2^11351561 is an apocalyptic number.

It is an amenable number.

11351561 is a deficient number, since it is larger than the sum of its proper divisors (940549).

11351561 is an equidigital number, since it uses as much as digits as its factorization.

11351561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67195 (or 67182 counting only the distinct ones).

The product of its digits is 450, while the sum is 23.

The square root of 11351561 is about 3369.2077703816. The cubic root of 11351561 is about 224.7424938813.

Adding to 11351561 its reverse (16515311), we get a palindrome (27866872).

The spelling of 11351561 in words is "eleven million, three hundred fifty-one thousand, five hundred sixty-one".