111709009 has 2 divisors, whose sum is σ = 111709010. Its totient is φ = 111709008.

The previous prime is 111708937. The next prime is 111709049. The reversal of 111709009 is 900907111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96963409 + 14745600 = 9847^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 111709009 - 2¹⁵ = 111676241 is a prime.

It is not a weakly prime, because it can be changed into another prime (111709049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55854504 + 55854505.

It is an arithmetic number, because the mean of its divisors is an integer number (55854505).

Almost surely, 2^111709009 is an apocalyptic number.

It is an amenable number.

111709009 is a deficient number, since it is larger than the sum of its proper divisors (1).

111709009 is an equidigital number, since it uses as much as digits as its factorization.

111709009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 111709009 is about 10569.2482703360. The cubic root of 111709009 is about 481.6106326156.

The spelling of 111709009 in words is "one hundred eleven million, seven hundred nine thousand, nine".