1218249983 has 2 divisors, whose sum is σ = 1218249984. Its totient is φ = 1218249982.

The previous prime is 1218249973. The next prime is 1218250027. The reversal of 1218249983 is 3899428121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1218249983 - 2²⁸ = 949814527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218249943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609124991 + 609124992.

It is an arithmetic number, because the mean of its divisors is an integer number (609124992).

Almost surely, 2^1218249983 is an apocalyptic number.

1218249983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218249983 is an equidigital number, since it uses as much as digits as its factorization.

1218249983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 1218249983 is about 34903.4379825254. The cubic root of 1218249983 is about 1068.0185716751.

The spelling of 1218249983 in words is "one billion, two hundred eighteen million, two hundred forty-nine thousand, nine hundred eighty-three".