1213045123 has 2 divisors, whose sum is σ = 1213045124. Its totient is φ = 1213045122.

The previous prime is 1213045087. The next prime is 1213045151. The reversal of 1213045123 is 3215403121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213045123 - 2²¹ = 1210947971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213045094 and 1213045103.

It is not a weakly prime, because it can be changed into another prime (1213046123) 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, 606522561 + 606522562.

It is an arithmetic number, because the mean of its divisors is an integer number (606522562).

Almost surely, 2^1213045123 is an apocalyptic number.

1213045123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213045123 is an equidigital number, since it uses as much as digits as its factorization.

1213045123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1213045123 is about 34828.7973234793. The cubic root of 1213045123 is about 1066.4953969915.

Adding to 1213045123 its reverse (3215403121), we get a palindrome (4428448244).

The spelling of 1213045123 in words is "one billion, two hundred thirteen million, forty-five thousand, one hundred twenty-three".