911199661 has 2 divisors, whose sum is σ = 911199662. Its totient is φ = 911199660.

The previous prime is 911199637. The next prime is 911199683. The reversal of 911199661 is 166991119.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482461225 + 428738436 = 21965^2 + 20706^2 .

It is a cyclic number.

It is not a de Polignac number, because 911199661 - 2¹⁷ = 911068589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (911799661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455599830 + 455599831.

It is an arithmetic number, because the mean of its divisors is an integer number (455599831).

Almost surely, 2^911199661 is an apocalyptic number.

It is an amenable number.

911199661 is a deficient number, since it is larger than the sum of its proper divisors (1).

911199661 is an equidigital number, since it uses as much as digits as its factorization.

911199661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 43.

The square root of 911199661 is about 30186.0838963917. The cubic root of 911199661 is about 969.4777579901.

The spelling of 911199661 in words is "nine hundred eleven million, one hundred ninety-nine thousand, six hundred sixty-one".