11515541 has 2 divisors, whose sum is σ = 11515542. Its totient is φ = 11515540.

The previous prime is 11515507. The next prime is 11515589. The reversal of 11515541 is 14551511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8439025 + 3076516 = 2905^2 + 1754^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515541 - 2¹⁸ = 11253397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11515591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5757770 + 5757771.

It is an arithmetic number, because the mean of its divisors is an integer number (5757771).

Almost surely, 2^11515541 is an apocalyptic number.

It is an amenable number.

11515541 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515541 is an equidigital number, since it uses as much as digits as its factorization.

11515541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 500, while the sum is 23.

The square root of 11515541 is about 3393.4556133829. The cubic root of 11515541 is about 225.8195037290.

The spelling of 11515541 in words is "eleven million, five hundred fifteen thousand, five hundred forty-one".