1245043391 has 2 divisors, whose sum is σ = 1245043392. Its totient is φ = 1245043390.

The previous prime is 1245043369. The next prime is 1245043417. The reversal of 1245043391 is 1933405421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1245043391 - 2¹⁸ = 1244781247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245045391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622521695 + 622521696.

It is an arithmetic number, because the mean of its divisors is an integer number (622521696).

Almost surely, 2^1245043391 is an apocalyptic number.

1245043391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245043391 is an equidigital number, since it uses as much as digits as its factorization.

1245043391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1245043391 is about 35285.1723957812. The cubic root of 1245043391 is about 1075.7916335170.

The spelling of 1245043391 in words is "one billion, two hundred forty-five million, forty-three thousand, three hundred ninety-one".