1218280783 has 2 divisors, whose sum is σ = 1218280784. Its totient is φ = 1218280782.

The previous prime is 1218280781. The next prime is 1218280799. The reversal of 1218280783 is 3870828121.

It is a weak prime.

It is an emirp because it is prime and its reverse (3870828121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1218280783 - 2¹ = 1218280781 is a prime.

Together with 1218280781, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218280781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609140391 + 609140392.

It is an arithmetic number, because the mean of its divisors is an integer number (609140392).

Almost surely, 2^1218280783 is an apocalyptic number.

1218280783 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218280783 is an equidigital number, since it uses as much as digits as its factorization.

1218280783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 1218280783 is about 34903.8791970176. The cubic root of 1218280783 is about 1068.0275722073.

The spelling of 1218280783 in words is "one billion, two hundred eighteen million, two hundred eighty thousand, seven hundred eighty-three".