1211413123 has 2 divisors, whose sum is σ = 1211413124. Its totient is φ = 1211413122.

The previous prime is 1211413117. The next prime is 1211413139. The reversal of 1211413123 is 3213141121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211413123 is a prime.

It is a super-3 number, since 3×1211413123³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1211413123.

It is not a weakly prime, because it can be changed into another prime (1211416123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605706561 + 605706562.

It is an arithmetic number, because the mean of its divisors is an integer number (605706562).

Almost surely, 2^1211413123 is an apocalyptic number.

1211413123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211413123 is an equidigital number, since it uses as much as digits as its factorization.

1211413123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 1211413123 is about 34805.3605497774. The cubic root of 1211413123 is about 1066.0169037655.

Adding to 1211413123 its reverse (3213141121), we get a palindrome (4424554244).

The spelling of 1211413123 in words is "one billion, two hundred eleven million, four hundred thirteen thousand, one hundred twenty-three".