11961589 has 2 divisors, whose sum is σ = 11961590. Its totient is φ = 11961588.

The previous prime is 11961569. The next prime is 11961647. The reversal of 11961589 is 98516911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10048900 + 1912689 = 3170^2 + 1383^2 .

It is an emirp because it is prime and its reverse (98516911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11961589 - 2⁷ = 11961461 is a prime.

It is a super-2 number, since 2×11961589² = 286159222809842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11961569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5980794 + 5980795.

It is an arithmetic number, because the mean of its divisors is an integer number (5980795).

Almost surely, 2^11961589 is an apocalyptic number.

It is an amenable number.

11961589 is a deficient number, since it is larger than the sum of its proper divisors (1).

11961589 is an equidigital number, since it uses as much as digits as its factorization.

11961589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 40.

The square root of 11961589 is about 3458.5530211347. The cubic root of 11961589 is about 228.6983117510.

The spelling of 11961589 in words is "eleven million, nine hundred sixty-one thousand, five hundred eighty-nine".