1241557643 has 2 divisors, whose sum is σ = 1241557644. Its totient is φ = 1241557642.

The previous prime is 1241557627. The next prime is 1241557693. The reversal of 1241557643 is 3467551421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1241557643 - 2⁴ = 1241557627 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1241557597 and 1241557606.

It is not a weakly prime, because it can be changed into another prime (1241557693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620778821 + 620778822.

It is an arithmetic number, because the mean of its divisors is an integer number (620778822).

Almost surely, 2^1241557643 is an apocalyptic number.

1241557643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1241557643 is an equidigital number, since it uses as much as digits as its factorization.

1241557643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The square root of 1241557643 is about 35235.7438264045. The cubic root of 1241557643 is about 1074.7867305063.

The spelling of 1241557643 in words is "one billion, two hundred forty-one million, five hundred fifty-seven thousand, six hundred forty-three".