1255511443 has 2 divisors, whose sum is σ = 1255511444. Its totient is φ = 1255511442.

The previous prime is 1255511441. The next prime is 1255511447. The reversal of 1255511443 is 3441155521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255511443 - 2¹ = 1255511441 is a prime.

Together with 1255511441, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1255511441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627755721 + 627755722.

It is an arithmetic number, because the mean of its divisors is an integer number (627755722).

Almost surely, 2^1255511443 is an apocalyptic number.

1255511443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255511443 is an equidigital number, since it uses as much as digits as its factorization.

1255511443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 31.

The square root of 1255511443 is about 35433.1969062911. The cubic root of 1255511443 is about 1078.7982296981.

Adding to 1255511443 its reverse (3441155521), we get a palindrome (4696666964).

The spelling of 1255511443 in words is "one billion, two hundred fifty-five million, five hundred eleven thousand, four hundred forty-three".