1243941893 has 2 divisors, whose sum is σ = 1243941894. Its totient is φ = 1243941892.

The previous prime is 1243941859. The next prime is 1243941911. The reversal of 1243941893 is 3981493421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 897721444 + 346220449 = 29962^2 + 18607^2 .

It is an emirp because it is prime and its reverse (3981493421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243941893 - 2¹⁶ = 1243876357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243941823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621970946 + 621970947.

It is an arithmetic number, because the mean of its divisors is an integer number (621970947).

Almost surely, 2^1243941893 is an apocalyptic number.

It is an amenable number.

1243941893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243941893 is an equidigital number, since it uses as much as digits as its factorization.

1243941893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 1243941893 is about 35269.5604310573. The cubic root of 1243941893 is about 1075.4742866232.

The spelling of 1243941893 in words is "one billion, two hundred forty-three million, nine hundred forty-one thousand, eight hundred ninety-three".