999229661 has 2 divisors, whose sum is σ = 999229662. Its totient is φ = 999229660.

The previous prime is 999229643. The next prime is 999229691. The reversal of 999229661 is 166922999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 808264900 + 190964761 = 28430^2 + 13819^2 .

It is a cyclic number.

It is not a de Polignac number, because 999229661 - 2²² = 995035357 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 (999229691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499614830 + 499614831.

It is an arithmetic number, because the mean of its divisors is an integer number (499614831).

Almost surely, 2^999229661 is an apocalyptic number.

It is an amenable number.

999229661 is a deficient number, since it is larger than the sum of its proper divisors (1).

999229661 is an equidigital number, since it uses as much as digits as its factorization.

999229661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 53.

The square root of 999229661 is about 31610.5941260205. The cubic root of 999229661 is about 999.7431543693.

The spelling of 999229661 in words is "nine hundred ninety-nine million, two hundred twenty-nine thousand, six hundred sixty-one".