312218983 has 2 divisors, whose sum is σ = 312218984. Its totient is φ = 312218982.

The previous prime is 312218947. The next prime is 312218989. The reversal of 312218983 is 389812213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312218983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312218989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156109491 + 156109492.

It is an arithmetic number, because the mean of its divisors is an integer number (156109492).

Almost surely, 2^312218983 is an apocalyptic number.

312218983 is a deficient number, since it is larger than the sum of its proper divisors (1).

312218983 is an equidigital number, since it uses as much as digits as its factorization.

312218983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 312218983 is about 17669.7193809070. The cubic root of 312218983 is about 678.4009304796.

It can be divided in two parts, 31221 and 8983, that added together give a palindrome (40204).

The spelling of 312218983 in words is "three hundred twelve million, two hundred eighteen thousand, nine hundred eighty-three".