111331309 has 2 divisors, whose sum is σ = 111331310. Its totient is φ = 111331308.

The previous prime is 111331307. The next prime is 111331321. The reversal of 111331309 is 903133111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89680900 + 21650409 = 9470^2 + 4653^2 .

It is a cyclic number.

It is not a de Polignac number, because 111331309 - 2¹ = 111331307 is a prime.

Together with 111331307, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 111331309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111331307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55665654 + 55665655.

It is an arithmetic number, because the mean of its divisors is an integer number (55665655).

Almost surely, 2^111331309 is an apocalyptic number.

It is an amenable number.

111331309 is a deficient number, since it is larger than the sum of its proper divisors (1).

111331309 is an equidigital number, since it uses as much as digits as its factorization.

111331309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 111331309 is about 10551.3652671112. The cubic root of 111331309 is about 481.0672275189.

The spelling of 111331309 in words is "one hundred eleven million, three hundred thirty-one thousand, three hundred nine".