1019992940809 has 2 divisors, whose sum is σ = 1019992940810. Its totient is φ = 1019992940808.

The previous prime is 1019992940797. The next prime is 1019992940893. The reversal of 1019992940809 is 9080492999101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990827132409 + 29165808400 = 995403^2 + 170780^2 .

It is an emirp because it is prime and its reverse (9080492999101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1019992940809 - 2¹³ = 1019992932617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1019992940509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509996470404 + 509996470405.

It is an arithmetic number, because the mean of its divisors is an integer number (509996470405).

Almost surely, 2^{1019992940809} is an apocalyptic number.

It is an amenable number.

1019992940809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019992940809 is an equidigital number, since it uses as much as digits as its factorization.

1019992940809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 61.

The spelling of 1019992940809 in words is "one trillion, nineteen billion, nine hundred ninety-two million, nine hundred forty thousand, eight hundred nine".