1213456523 has 2 divisors, whose sum is σ = 1213456524. Its totient is φ = 1213456522.

The previous prime is 1213456513. The next prime is 1213456547. The reversal of 1213456523 is 3256543121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213456523 - 2⁸ = 1213456267 is a prime.

It is a super-2 number, since 2×1213456523² = 2944953466422499058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1213456523.

It is not a weakly prime, because it can be changed into another prime (1213456513) 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, 606728261 + 606728262.

It is an arithmetic number, because the mean of its divisors is an integer number (606728262).

Almost surely, 2^1213456523 is an apocalyptic number.

1213456523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213456523 is an equidigital number, since it uses as much as digits as its factorization.

1213456523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 32.

The square root of 1213456523 is about 34834.7028550553. The cubic root of 1213456523 is about 1066.6159494223.

Adding to 1213456523 its reverse (3256543121), we get a palindrome (4469999644).

The spelling of 1213456523 in words is "one billion, two hundred thirteen million, four hundred fifty-six thousand, five hundred twenty-three".