11553989 has 2 divisors, whose sum is σ = 11553990. Its totient is φ = 11553988.

The previous prime is 11553943. The next prime is 11554001. The reversal of 11553989 is 98935511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5841889 + 5712100 = 2417^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 11553989 - 2⁸ = 11553733 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 (11553089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5776994 + 5776995.

It is an arithmetic number, because the mean of its divisors is an integer number (5776995).

Almost surely, 2^11553989 is an apocalyptic number.

It is an amenable number.

11553989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11553989 is an equidigital number, since it uses as much as digits as its factorization.

11553989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The square root of 11553989 is about 3399.1159144695. The cubic root of 11553989 is about 226.0705460191.

The spelling of 11553989 in words is "eleven million, five hundred fifty-three thousand, nine hundred eighty-nine".