1305990490787 has 2 divisors, whose sum is σ = 1305990490788. Its totient is φ = 1305990490786.

The previous prime is 1305990490769. The next prime is 1305990490823. The reversal of 1305990490787 is 7870940995031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1305990490787 - 2¹⁰ = 1305990489763 is a prime.

It is a super-2 number, since 2×1305990490787² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1305990492787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652995245393 + 652995245394.

It is an arithmetic number, because the mean of its divisors is an integer number (652995245394).

Almost surely, 2^{1305990490787} is an apocalyptic number.

1305990490787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305990490787 is an equidigital number, since it uses as much as digits as its factorization.

1305990490787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 62.

The spelling of 1305990490787 in words is "one trillion, three hundred five billion, nine hundred ninety million, four hundred ninety thousand, seven hundred eighty-seven".