1216603523 has 2 divisors, whose sum is σ = 1216603524. Its totient is φ = 1216603522.

The previous prime is 1216603501. The next prime is 1216603529. The reversal of 1216603523 is 3253066121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216603523 - 2¹² = 1216599427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1216603529) 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, 608301761 + 608301762.

It is an arithmetic number, because the mean of its divisors is an integer number (608301762).

Almost surely, 2^1216603523 is an apocalyptic number.

1216603523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216603523 is an equidigital number, since it uses as much as digits as its factorization.

1216603523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1216603523 is about 34879.8440793533. The cubic root of 1216603523 is about 1067.5372138102.

Adding to 1216603523 its reverse (3253066121), we get a palindrome (4469669644).

The spelling of 1216603523 in words is "one billion, two hundred sixteen million, six hundred three thousand, five hundred twenty-three".