11312009 has 2 divisors, whose sum is σ = 11312010. Its totient is φ = 11312008.

The previous prime is 11311999. The next prime is 11312033. The reversal of 11312009 is 90021311.

It is a happy number.

11312009 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8761600 + 2550409 = 2960^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 11312009 - 2⁸ = 11311753 is a prime.

It is not a weakly prime, because it can be changed into another prime (11312039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5656004 + 5656005.

It is an arithmetic number, because the mean of its divisors is an integer number (5656005).

Almost surely, 2^11312009 is an apocalyptic number.

It is an amenable number.

11312009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11312009 is an equidigital number, since it uses as much as digits as its factorization.

11312009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 11312009 is about 3363.3330194912. Note that the first 3 decimals coincide. The cubic root of 11312009 is about 224.4811683220.

The spelling of 11312009 in words is "eleven million, three hundred twelve thousand, nine".