11211331909 has 2 divisors, whose sum is σ = 11211331910. Its totient is φ = 11211331908.

The previous prime is 11211331903. The next prime is 11211331931. The reversal of 11211331909 is 90913311211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8752163809 + 2459168100 = 93553^2 + 49590^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211331909 - 2¹¹ = 11211329861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211331903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605665954 + 5605665955.

It is an arithmetic number, because the mean of its divisors is an integer number (5605665955).

Almost surely, 2^11211331909 is an apocalyptic number.

It is an amenable number.

11211331909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211331909 is an equidigital number, since it uses as much as digits as its factorization.

11211331909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The spelling of 11211331909 in words is "eleven billion, two hundred eleven million, three hundred thirty-one thousand, nine hundred nine".