1251255443 has 2 divisors, whose sum is σ = 1251255444. Its totient is φ = 1251255442.

The previous prime is 1251255419. The next prime is 1251255451. The reversal of 1251255443 is 3445521521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251255443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251255413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625627721 + 625627722.

It is an arithmetic number, because the mean of its divisors is an integer number (625627722).

Almost surely, 2^1251255443 is an apocalyptic number.

1251255443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251255443 is an equidigital number, since it uses as much as digits as its factorization.

1251255443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 32.

The square root of 1251255443 is about 35373.0892487495. The cubic root of 1251255443 is about 1077.5778603412.

Adding to 1251255443 its reverse (3445521521), we get a palindrome (4696776964).

The spelling of 1251255443 in words is "one billion, two hundred fifty-one million, two hundred fifty-five thousand, four hundred forty-three".