1211629871 has 2 divisors, whose sum is σ = 1211629872. Its totient is φ = 1211629870.

The previous prime is 1211629817. The next prime is 1211629897. The reversal of 1211629871 is 1789261121.

Together with previous prime (1211629817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211629871 - 2⁶ = 1211629807 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211629571) 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, 605814935 + 605814936.

It is an arithmetic number, because the mean of its divisors is an integer number (605814936).

Almost surely, 2^1211629871 is an apocalyptic number.

1211629871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211629871 is an equidigital number, since it uses as much as digits as its factorization.

1211629871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 38.

The square root of 1211629871 is about 34808.4741262814. The cubic root of 1211629871 is about 1066.0804777984.

The spelling of 1211629871 in words is "one billion, two hundred eleven million, six hundred twenty-nine thousand, eight hundred seventy-one".