11521691 has 2 divisors, whose sum is σ = 11521692. Its totient is φ = 11521690.

The previous prime is 11521687. The next prime is 11521703. The reversal of 11521691 is 19612511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11521691 - 2² = 11521687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11521691.

It is not a weakly prime, because it can be changed into another prime (11521651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760845 + 5760846.

It is an arithmetic number, because the mean of its divisors is an integer number (5760846).

Almost surely, 2^11521691 is an apocalyptic number.

11521691 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521691 is an equidigital number, since it uses as much as digits as its factorization.

11521691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 26.

The square root of 11521691 is about 3394.3616483810. The cubic root of 11521691 is about 225.8596970292.

The spelling of 11521691 in words is "eleven million, five hundred twenty-one thousand, six hundred ninety-one".