11890900009 has 2 divisors, whose sum is σ = 11890900010. Its totient is φ = 11890900008.

The previous prime is 11890900001. The next prime is 11890900027. The reversal of 11890900009 is 90000909811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10584294400 + 1306605609 = 102880^2 + 36147^2 .

It is a cyclic number.

It is not a de Polignac number, because 11890900009 - 2³ = 11890900001 is a prime.

It is not a weakly prime, because it can be changed into another prime (11890900001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945450004 + 5945450005.

It is an arithmetic number, because the mean of its divisors is an integer number (5945450005).

Almost surely, 2^11890900009 is an apocalyptic number.

It is an amenable number.

11890900009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11890900009 is an equidigital number, since it uses as much as digits as its factorization.

11890900009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 11890900009 in words is "eleven billion, eight hundred ninety million, nine hundred thousand, nine".