11521603 has 2 divisors, whose sum is σ = 11521604. Its totient is φ = 11521602.

The previous prime is 11521591. The next prime is 11521607. The reversal of 11521603 is 30612511.

It is a strong prime.

It is an emirp because it is prime and its reverse (30612511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11521603 - 2¹⁷ = 11390531 is a prime.

It is not a weakly prime, because it can be changed into another prime (11521607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760801 + 5760802.

It is an arithmetic number, because the mean of its divisors is an integer number (5760802).

Almost surely, 2^11521603 is an apocalyptic number.

11521603 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521603 is an equidigital number, since it uses as much as digits as its factorization.

11521603 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 19.

The square root of 11521603 is about 3394.3486856833. The cubic root of 11521603 is about 225.8591220064.

The spelling of 11521603 in words is "eleven million, five hundred twenty-one thousand, six hundred three".