1211666441 has 2 divisors, whose sum is σ = 1211666442. Its totient is φ = 1211666440.

The previous prime is 1211666437. The next prime is 1211666471. The reversal of 1211666441 is 1446661121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637057600 + 574608841 = 25240^2 + 23971^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211666441 - 2² = 1211666437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211666398 and 1211666407.

It is not a weakly prime, because it can be changed into another prime (1211666471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605833220 + 605833221.

It is an arithmetic number, because the mean of its divisors is an integer number (605833221).

Almost surely, 2^1211666441 is an apocalyptic number.

It is an amenable number.

1211666441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211666441 is an equidigital number, since it uses as much as digits as its factorization.

1211666441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 1211666441 is about 34808.9994254359. Note that the first 3 decimals coincide. The cubic root of 1211666441 is about 1066.0912033430.

The spelling of 1211666441 in words is "one billion, two hundred eleven million, six hundred sixty-six thousand, four hundred forty-one".