11500661 has 2 divisors, whose sum is σ = 11500662. Its totient is φ = 11500660.

The previous prime is 11500649. The next prime is 11500703. The reversal of 11500661 is 16600511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11458225 + 42436 = 3385^2 + 206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11500661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11500631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5750330 + 5750331.

It is an arithmetic number, because the mean of its divisors is an integer number (5750331).

Almost surely, 2^11500661 is an apocalyptic number.

It is an amenable number.

11500661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11500661 is an equidigital number, since it uses as much as digits as its factorization.

11500661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 11500661 is about 3391.2624492952. The cubic root of 11500661 is about 225.7221963144.

The spelling of 11500661 in words is "eleven million, five hundred thousand, six hundred sixty-one".