1211665033 has 2 divisors, whose sum is σ = 1211665034. Its totient is φ = 1211665032.

The previous prime is 1211664997. The next prime is 1211665057. The reversal of 1211665033 is 3305661121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617621904 + 594043129 = 24852^2 + 24373^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211665033 - 2⁹ = 1211664521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211664992 and 1211665010.

It is not a weakly prime, because it can be changed into another prime (1211665073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605832516 + 605832517.

It is an arithmetic number, because the mean of its divisors is an integer number (605832517).

Almost surely, 2^1211665033 is an apocalyptic number.

It is an amenable number.

1211665033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211665033 is an equidigital number, since it uses as much as digits as its factorization.

1211665033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1211665033 is about 34808.9792007752. The cubic root of 1211665033 is about 1066.0907903974.

The spelling of 1211665033 in words is "one billion, two hundred eleven million, six hundred sixty-five thousand, thirty-three".