11521817 has 2 divisors, whose sum is σ = 11521818. Its totient is φ = 11521816.

The previous prime is 11521813. The next prime is 11521823. The reversal of 11521817 is 71812511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11262736 + 259081 = 3356^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 11521817 - 2² = 11521813 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11521813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760908 + 5760909.

It is an arithmetic number, because the mean of its divisors is an integer number (5760909).

Almost surely, 2^11521817 is an apocalyptic number.

It is an amenable number.

11521817 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521817 is an equidigital number, since it uses as much as digits as its factorization.

11521817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560, while the sum is 26.

The square root of 11521817 is about 3394.3802085211. The cubic root of 11521817 is about 225.8605203521.

The spelling of 11521817 in words is "eleven million, five hundred twenty-one thousand, eight hundred seventeen".