11428561 has 4 divisors (see below), whose sum is σ = 11486772. Its totient is φ = 11370352.

The previous prime is 11428559. The next prime is 11428591. The reversal of 11428561 is 16582411.

11428561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10857025 + 571536 = 3295^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 11428561 - 2¹ = 11428559 is a prime.

It is a super-2 number, since 2×11428561² = 261224013061442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11428511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28810 + ... + 29203.

It is an arithmetic number, because the mean of its divisors is an integer number (2871693).

Almost surely, 2^11428561 is an apocalyptic number.

It is an amenable number.

11428561 is a deficient number, since it is larger than the sum of its proper divisors (58211).

11428561 is an equidigital number, since it uses as much as digits as its factorization.

11428561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58210.

The product of its digits is 1920, while the sum is 28.

The square root of 11428561 is about 3380.6154765072. The cubic root of 11428561 is about 225.2495075753.

The spelling of 11428561 in words is "eleven million, four hundred twenty-eight thousand, five hundred sixty-one".