1009781804639 has 2 divisors, whose sum is σ = 1009781804640. Its totient is φ = 1009781804638.

The previous prime is 1009781804627. The next prime is 1009781804657. The reversal of 1009781804639 is 9364081879001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1009781804639 - 2¹⁶ = 1009781739103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009781806639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504890902319 + 504890902320.

It is an arithmetic number, because the mean of its divisors is an integer number (504890902320).

Almost surely, 2^{1009781804639} is an apocalyptic number.

1009781804639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009781804639 is an equidigital number, since it uses as much as digits as its factorization.

1009781804639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 1009781804639 in words is "one trillion, nine billion, seven hundred eighty-one million, eight hundred four thousand, six hundred thirty-nine".