10991213 has 2 divisors, whose sum is σ = 10991214. Its totient is φ = 10991212.

The previous prime is 10991207. The next prime is 10991219. The reversal of 10991213 is 31219901.

It is a balanced prime because it is at equal distance from previous prime (10991207) and next prime (10991219).

It can be written as a sum of positive squares in only one way, i.e., 8421604 + 2569609 = 2902^2 + 1603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10991213 is a prime.

It is a super-2 number, since 2×10991213² = 241613526422738, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10991219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495606 + 5495607.

It is an arithmetic number, because the mean of its divisors is an integer number (5495607).

Almost surely, 2^10991213 is an apocalyptic number.

It is an amenable number.

10991213 is a deficient number, since it is larger than the sum of its proper divisors (1).

10991213 is an equidigital number, since it uses as much as digits as its factorization.

10991213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 10991213 is about 3315.2998356106. The cubic root of 10991213 is about 222.3387747572.

The spelling of 10991213 in words is "ten million, nine hundred ninety-one thousand, two hundred thirteen".