1278433243 has 2 divisors, whose sum is σ = 1278433244. Its totient is φ = 1278433242.

The previous prime is 1278433241. The next prime is 1278433283. The reversal of 1278433243 is 3423348721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1278433243 - 2¹ = 1278433241 is a prime.

Together with 1278433241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1278433241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639216621 + 639216622.

It is an arithmetic number, because the mean of its divisors is an integer number (639216622).

Almost surely, 2^1278433243 is an apocalyptic number.

1278433243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278433243 is an equidigital number, since it uses as much as digits as its factorization.

1278433243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 37.

The square root of 1278433243 is about 35755.1848408032. The cubic root of 1278433243 is about 1085.3238623484.

The spelling of 1278433243 in words is "one billion, two hundred seventy-eight million, four hundred thirty-three thousand, two hundred forty-three".