1213123023139 has 2 divisors, whose sum is σ = 1213123023140. Its totient is φ = 1213123023138.

The previous prime is 1213123023043. The next prime is 1213123023241. The reversal of 1213123023139 is 9313203213121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213123023139 - 2²³ = 1213114634531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213123023139.

It is not a weakly prime, because it can be changed into another prime (1213123021139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606561511569 + 606561511570.

It is an arithmetic number, because the mean of its divisors is an integer number (606561511570).

Almost surely, 2^{1213123023139} is an apocalyptic number.

1213123023139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213123023139 is an equidigital number, since it uses as much as digits as its factorization.

1213123023139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The spelling of 1213123023139 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, twenty-three thousand, one hundred thirty-nine".