1240311979 has 2 divisors, whose sum is σ = 1240311980. Its totient is φ = 1240311978.

The previous prime is 1240311977. The next prime is 1240312009. The reversal of 1240311979 is 9791130421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1240311979 - 2¹ = 1240311977 is a prime.

Together with 1240311977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1240311977) 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, 620155989 + 620155990.

It is an arithmetic number, because the mean of its divisors is an integer number (620155990).

Almost surely, 2^1240311979 is an apocalyptic number.

1240311979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240311979 is an equidigital number, since it uses as much as digits as its factorization.

1240311979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1240311979 is about 35218.0632488500. The cubic root of 1240311979 is about 1074.4271630588.

The spelling of 1240311979 in words is "one billion, two hundred forty million, three hundred eleven thousand, nine hundred seventy-nine".