1211231123 has 2 divisors, whose sum is σ = 1211231124. Its totient is φ = 1211231122.

The previous prime is 1211231117. The next prime is 1211231213. The reversal of 1211231123 is 3211321121.

Together with next prime (1211231213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211231123 - 2¹² = 1211227027 is a prime.

It is a super-2 number, since 2×1211231123² = 2934161666647682258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211230123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605615561 + 605615562.

It is an arithmetic number, because the mean of its divisors is an integer number (605615562).

Almost surely, 2^1211231123 is an apocalyptic number.

1211231123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211231123 is an equidigital number, since it uses as much as digits as its factorization.

1211231123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 1211231123 is about 34802.7459117812. The cubic root of 1211231123 is about 1065.9635157595.

Adding to 1211231123 its reverse (3211321121), we get a palindrome (4422552244).

The spelling of 1211231123 in words is "one billion, two hundred eleven million, two hundred thirty-one thousand, one hundred twenty-three".