111151109 has 2 divisors, whose sum is σ = 111151110. Its totient is φ = 111151108.

The previous prime is 111151097. The next prime is 111151127. The reversal of 111151109 is 901151111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84916225 + 26234884 = 9215^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 111151109 - 2⁴ = 111151093 is a prime.

It is a super-5 number, since 5×111151109⁵ (a number of 41 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111151189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55575554 + 55575555.

It is an arithmetic number, because the mean of its divisors is an integer number (55575555).

Almost surely, 2^111151109 is an apocalyptic number.

It is an amenable number.

111151109 is a deficient number, since it is larger than the sum of its proper divisors (1).

111151109 is an equidigital number, since it uses as much as digits as its factorization.

111151109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45, while the sum is 20.

The square root of 111151109 is about 10542.8226296377. The cubic root of 111151109 is about 480.8075367865.

The spelling of 111151109 in words is "one hundred eleven million, one hundred fifty-one thousand, one hundred nine".