1251307441243 has 2 divisors, whose sum is σ = 1251307441244. Its totient is φ = 1251307441242.

The previous prime is 1251307441199. The next prime is 1251307441283. The reversal of 1251307441243 is 3421447031521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251307441243 - 2²⁹ = 1250770570331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251307441283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625653720621 + 625653720622.

It is an arithmetic number, because the mean of its divisors is an integer number (625653720622).

Almost surely, 2^{1251307441243} is an apocalyptic number.

1251307441243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251307441243 is an equidigital number, since it uses as much as digits as its factorization.

1251307441243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 1251307441243 in words is "one trillion, two hundred fifty-one billion, three hundred seven million, four hundred forty-one thousand, two hundred forty-three".