11811582892009 has 2 divisors, whose sum is σ = 11811582892010. Its totient is φ = 11811582892008.

The previous prime is 11811582891991. The next prime is 11811582892061. The reversal of 11811582892009 is 90029828511811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11781390354409 + 30192537600 = 3432403^2 + 173760^2 .

It is a cyclic number.

It is not a de Polignac number, because 11811582892009 - 2³³ = 11802992957417 is a prime.

It is not a weakly prime, because it can be changed into another prime (11811582892069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905791446004 + 5905791446005.

It is an arithmetic number, because the mean of its divisors is an integer number (5905791446005).

Almost surely, 2^{11811582892009} is an apocalyptic number.

It is an amenable number.

11811582892009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811582892009 is an equidigital number, since it uses as much as digits as its factorization.

11811582892009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 55.

The spelling of 11811582892009 in words is "eleven trillion, eight hundred eleven billion, five hundred eighty-two million, eight hundred ninety-two thousand, nine".