311220983 has 2 divisors, whose sum is σ = 311220984. Its totient is φ = 311220982.

The previous prime is 311220979. The next prime is 311221003. The reversal of 311220983 is 389022113.

It is a weak prime.

It is an emirp because it is prime and its reverse (389022113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311220983 - 2² = 311220979 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311520983) 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, 155610491 + 155610492.

It is an arithmetic number, because the mean of its divisors is an integer number (155610492).

Almost surely, 2^311220983 is an apocalyptic number.

311220983 is a deficient number, since it is larger than the sum of its proper divisors (1).

311220983 is an equidigital number, since it uses as much as digits as its factorization.

311220983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 311220983 is about 17641.4563741206. The cubic root of 311220983 is about 677.6773285270.

The spelling of 311220983 in words is "three hundred eleven million, two hundred twenty thousand, nine hundred eighty-three".