1211231269 has 2 divisors, whose sum is σ = 1211231270. Its totient is φ = 1211231268.

The previous prime is 1211231261. The next prime is 1211231309. The reversal of 1211231269 is 9621321121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623750625 + 587480644 = 24975^2 + 24238^2 .

It is an emirp because it is prime and its reverse (9621321121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211231269 - 2³ = 1211231261 is a prime.

It is a super-2 number, since 2×1211231269² = 2934162374006700722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211231261) 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, 605615634 + 605615635.

It is an arithmetic number, because the mean of its divisors is an integer number (605615635).

Almost surely, 2^1211231269 is an apocalyptic number.

It is an amenable number.

1211231269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211231269 is an equidigital number, since it uses as much as digits as its factorization.

1211231269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 1211231269 is about 34802.7480093167. The cubic root of 1211231269 is about 1065.9635585894.

The spelling of 1211231269 in words is "one billion, two hundred eleven million, two hundred thirty-one thousand, two hundred sixty-nine".