1311421043 has 2 divisors, whose sum is σ = 1311421044. Its totient is φ = 1311421042.

The previous prime is 1311421031. The next prime is 1311421063. The reversal of 1311421043 is 3401241131.

It is an a-pointer prime, because the next prime (1311421063) can be obtained adding 1311421043 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311421043 - 2¹² = 1311416947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311421063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655710521 + 655710522.

It is an arithmetic number, because the mean of its divisors is an integer number (655710522).

Almost surely, 2^1311421043 is an apocalyptic number.

1311421043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311421043 is an equidigital number, since it uses as much as digits as its factorization.

1311421043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1311421043 is about 36213.5477825634. The cubic root of 1311421043 is about 1094.5796828603.

Adding to 1311421043 its reverse (3401241131), we get a palindrome (4712662174).

The spelling of 1311421043 in words is "one billion, three hundred eleven million, four hundred twenty-one thousand, forty-three".