1213456553 has 2 divisors, whose sum is σ = 1213456554. Its totient is φ = 1213456552.

The previous prime is 1213456547. The next prime is 1213456567. The reversal of 1213456553 is 3556543121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 942919849 + 270536704 = 30707^2 + 16448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213456553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

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, 606728276 + 606728277.

It is an arithmetic number, because the mean of its divisors is an integer number (606728277).

Almost surely, 2^1213456553 is an apocalyptic number.

It is an amenable number.

1213456553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213456553 is an equidigital number, since it uses as much as digits as its factorization.

1213456553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 35.

The square root of 1213456553 is about 34834.7032856604. The cubic root of 1213456553 is about 1066.6159582122.

Adding to 1213456553 its reverse (3556543121), we get a palindrome (4769999674).

The spelling of 1213456553 in words is "one billion, two hundred thirteen million, four hundred fifty-six thousand, five hundred fifty-three".