1321153663 has 2 divisors, whose sum is σ = 1321153664. Its totient is φ = 1321153662.

The previous prime is 1321153651. The next prime is 1321153679. The reversal of 1321153663 is 3663511231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321153663 - 2¹³ = 1321145471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321153633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660576831 + 660576832.

It is an arithmetic number, because the mean of its divisors is an integer number (660576832).

Almost surely, 2^1321153663 is an apocalyptic number.

1321153663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321153663 is an equidigital number, since it uses as much as digits as its factorization.

1321153663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 1321153663 is about 36347.6775461652. The cubic root of 1321153663 is about 1097.2807941157.

Adding to 1321153663 its reverse (3663511231), we get a palindrome (4984664894).

The spelling of 1321153663 in words is "one billion, three hundred twenty-one million, one hundred fifty-three thousand, six hundred sixty-three".