1211499979 has 2 divisors, whose sum is σ = 1211499980. Its totient is φ = 1211499978.

The previous prime is 1211499973. The next prime is 1211500039. The reversal of 1211499979 is 9799941121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211499979 - 2¹⁵ = 1211467211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211499973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605749989 + 605749990.

It is an arithmetic number, because the mean of its divisors is an integer number (605749990).

Almost surely, 2^1211499979 is an apocalyptic number.

1211499979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211499979 is an equidigital number, since it uses as much as digits as its factorization.

1211499979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 52.

The square root of 1211499979 is about 34806.6082662474. The cubic root of 1211499979 is about 1066.0423802799.

The spelling of 1211499979 in words is "one billion, two hundred eleven million, four hundred ninety-nine thousand, nine hundred seventy-nine".