11531331109 has 2 divisors, whose sum is σ = 11531331110. Its totient is φ = 11531331108.

The previous prime is 11531331079. The next prime is 11531331157. The reversal of 11531331109 is 90113313511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11261878884 + 269452225 = 106122^2 + 16415^2 .

It is a cyclic number.

It is not a de Polignac number, because 11531331109 - 2¹³ = 11531322917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11531331209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5765665554 + 5765665555.

It is an arithmetic number, because the mean of its divisors is an integer number (5765665555).

Almost surely, 2^11531331109 is an apocalyptic number.

It is an amenable number.

11531331109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11531331109 is an equidigital number, since it uses as much as digits as its factorization.

11531331109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 28.

The spelling of 11531331109 in words is "eleven billion, five hundred thirty-one million, three hundred thirty-one thousand, one hundred nine".