1217632553 has 2 divisors, whose sum is σ = 1217632554. Its totient is φ = 1217632552.

The previous prime is 1217632543. The next prime is 1217632597. The reversal of 1217632553 is 3552367121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852172864 + 365459689 = 29192^2 + 19117^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217632553 - 2¹⁰ = 1217631529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217632543) 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, 608816276 + 608816277.

It is an arithmetic number, because the mean of its divisors is an integer number (608816277).

Almost surely, 2^1217632553 is an apocalyptic number.

It is an amenable number.

1217632553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217632553 is an equidigital number, since it uses as much as digits as its factorization.

1217632553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 35.

The square root of 1217632553 is about 34894.5920308577. The cubic root of 1217632553 is about 1067.8381111374.

Adding to 1217632553 its reverse (3552367121), we get a palindrome (4769999674).

The spelling of 1217632553 in words is "one billion, two hundred seventeen million, six hundred thirty-two thousand, five hundred fifty-three".