1211479369 has 2 divisors, whose sum is σ = 1211479370. Its totient is φ = 1211479368.

The previous prime is 1211479309. The next prime is 1211479393. The reversal of 1211479369 is 9639741121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 700131600 + 511347769 = 26460^2 + 22613^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211479369 - 2¹⁷ = 1211348297 is a prime.

It is a super-2 number, since 2×1211479369² = 2935364523025276322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211479309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605739684 + 605739685.

It is an arithmetic number, because the mean of its divisors is an integer number (605739685).

Almost surely, 2^1211479369 is an apocalyptic number.

It is an amenable number.

1211479369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211479369 is an equidigital number, since it uses as much as digits as its factorization.

1211479369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 1211479369 is about 34806.3122005190. The cubic root of 1211479369 is about 1066.0363350857.

The spelling of 1211479369 in words is "one billion, two hundred eleven million, four hundred seventy-nine thousand, three hundred sixty-nine".