11002561 has 2 divisors, whose sum is σ = 11002562. Its totient is φ = 11002560.

The previous prime is 11002549. The next prime is 11002583. The reversal of 11002561 is 16520011.

It is a happy number.

11002561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6922161 + 4080400 = 2631^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 11002561 - 2⁵ = 11002529 is a prime.

It is not a weakly prime, because it can be changed into another prime (11002531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5501280 + 5501281.

It is an arithmetic number, because the mean of its divisors is an integer number (5501281).

Almost surely, 2^11002561 is an apocalyptic number.

It is an amenable number.

11002561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11002561 is an equidigital number, since it uses as much as digits as its factorization.

11002561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 11002561 is about 3317.0108531628. The cubic root of 11002561 is about 222.4152671510.

Adding to 11002561 its reverse (16520011), we get a palindrome (27522572).

The spelling of 11002561 in words is "eleven million, two thousand, five hundred sixty-one".