311229979 has 2 divisors, whose sum is σ = 311229980. Its totient is φ = 311229978.

The previous prime is 311229967. The next prime is 311230009. The reversal of 311229979 is 979922113.

It is a weak prime.

It is an emirp because it is prime and its reverse (979922113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311229979 - 2¹³ = 311221787 is a prime.

It is not a weakly prime, because it can be changed into another prime (311229929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155614989 + 155614990.

It is an arithmetic number, because the mean of its divisors is an integer number (155614990).

Almost surely, 2^311229979 is an apocalyptic number.

311229979 is a deficient number, since it is larger than the sum of its proper divisors (1).

311229979 is an equidigital number, since it uses as much as digits as its factorization.

311229979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 311229979 is about 17641.7113398899. The cubic root of 311229979 is about 677.6838579995.

The spelling of 311229979 in words is "three hundred eleven million, two hundred twenty-nine thousand, nine hundred seventy-nine".