1240431817 has 2 divisors, whose sum is σ = 1240431818. Its totient is φ = 1240431816.

The previous prime is 1240431811. The next prime is 1240431827. The reversal of 1240431817 is 7181340421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1230325776 + 10106041 = 35076^2 + 3179^2 .

It is an emirp because it is prime and its reverse (7181340421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240431817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240431811) 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, 620215908 + 620215909.

It is an arithmetic number, because the mean of its divisors is an integer number (620215909).

Almost surely, 2^1240431817 is an apocalyptic number.

It is an amenable number.

1240431817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240431817 is an equidigital number, since it uses as much as digits as its factorization.

1240431817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1240431817 is about 35219.7645789974. The cubic root of 1240431817 is about 1074.4617653895.

The spelling of 1240431817 in words is "one billion, two hundred forty million, four hundred thirty-one thousand, eight hundred seventeen".