1242000311 has 2 divisors, whose sum is σ = 1242000312. Its totient is φ = 1242000310.

The previous prime is 1242000307. The next prime is 1242000323. The reversal of 1242000311 is 1130002421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242000311 - 2² = 1242000307 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242000811) 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, 621000155 + 621000156.

It is an arithmetic number, because the mean of its divisors is an integer number (621000156).

Almost surely, 2^1242000311 is an apocalyptic number.

1242000311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242000311 is an equidigital number, since it uses as much as digits as its factorization.

1242000311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1242000311 is about 35242.0247857583. The cubic root of 1242000311 is about 1074.9144510252.

Adding to 1242000311 its reverse (1130002421), we get a palindrome (2372002732).

The spelling of 1242000311 in words is "one billion, two hundred forty-two million, three hundred eleven", and thus it is an aban number.