1216571383 has 2 divisors, whose sum is σ = 1216571384. Its totient is φ = 1216571382.

The previous prime is 1216571309. The next prime is 1216571417. The reversal of 1216571383 is 3831756121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216571383 - 2¹³ = 1216563191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216571483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608285691 + 608285692.

It is an arithmetic number, because the mean of its divisors is an integer number (608285692).

Almost surely, 2^1216571383 is an apocalyptic number.

1216571383 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216571383 is an equidigital number, since it uses as much as digits as its factorization.

1216571383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 1216571383 is about 34879.3833517739. The cubic root of 1216571383 is about 1067.5278130625.

The spelling of 1216571383 in words is "one billion, two hundred sixteen million, five hundred seventy-one thousand, three hundred eighty-three".